Salts of an epidermal growth factor receptor kinase inhibitor

ABSTRACT

The present invention provides a salt form and compositions thereof, which are useful as an inhibitor of EGFR kinases and which exhibits desirable characteristics for the same.

CROSS REFERENCE TO RELATED CASES

The present application claims priority to U.S. provisional applicationSer. No. 61/611,400, filed Mar. 15, 2012, the entirety of which ishereby incorporated by reference.

FIELD OF THE INVENTION

The present invention provides salt forms of a compound useful asmutant-selective inhibitors of epidermal growth factor receptor (EGFR)kinase, including polymorphic forms of certain salts. The invention alsoprovides pharmaceutically acceptable compositions comprising salt formsof the present invention and methods of using the compositions in thetreatment of various disorders.

BACKGROUND OF THE INVENTION

Protein tyrosine kinases are a class of enzymes that catalyze thetransfer of a phosphate group from ATP or GTP to a tyrosine residuelocated on a protein substrate. Receptor tyrosine kinases act totransmit signals from the outside of a cell to the inside by activatingsecondary messaging effectors via a phosphorylation event. A variety ofcellular processes are promoted by these signals, includingproliferation, carbohydrate utilization, protein synthesis,angiogenesis, cell growth, and cell survival.

There is strong precedent for involvement of the EGFR in human cancerbecause over 60% of all solid tumors overexpress at least one of theseproteins or their ligands. Overexpression of EGFR is commonly found inbreast, lung, head and neck, bladder tumors.

Activating mutations in the tyrosine kinase domain of EGFR have beenidentified in patients with non-small cell lung cancer (Lin, N. U.;Winer, E. P., Breast Cancer Res 6: 204-210, 2004). The reversibleinhibitors Tarceva (erlotinib) and Iressa (gefitinib) currently arefirst-line therapy for non-small cell lung cancer patients withactivating mutations. The most common activating mutations are L858R anddelE746-A750.

Additionally, in the majority of patients that relapse, acquired drugresistance, such as by mutation of gatekeeper residue T790M, has beendetected in at least half of such clinically resistant patients.Moreover, T790M may also be pre-existing; there may be an independent,oncogenic role for the T790M mutation. For example, there are patientswith the L858R/T790M mutation who never received gefitinib treatment. Inaddition, germline EGFR T790M mutations are linked with certain familiallung cancers.

Current drugs in development, including second-generation covalentinhibitors, such as BIBW2992, HKI-272 and PF-0299804, are effectiveagainst the T790M resistance mutation but exhibit dose-limitingtoxicities due to concurrent inhibition of WT EGFR. Accordingly, thereremains a need to find mutant-selective EGFR kinase inhibitors useful astherapeutic agents.

SUMMARY OF THE INVENTION

It has now been found that the novel benzenesulfonic acid, camphorsulfonic acid, 1,2-ethane disulfonic acid, hydrobromic acid,hydrochloric acid, maleic acid, methanesulfonic acid,naphthalene-2-sulfonic acid, 1,5-naphthalene disulfonic acid, oxalicacid, 4-toluenesulfonic acid or 2,4,6-trihydroxybenzoic acid salts ofthe present invention, and compositions thereof, are useful asmutant-selective inhibitors of one or more EGFR kinases and exhibitsdesirable characteristics for the same. In general, these salts, andpharmaceutically acceptable compositions thereof, are useful fortreating or lessening the severity of a variety of diseases or disordersas described in detail herein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 depicts the x-ray powder diffraction (XRPD) pattern for abis-besylate salt of Compound 1.

FIG. 2 depicts the thermogravimetric analysis (TGA) pattern for abis-besylate salt of Compound 1.

FIG. 3 depicts the thermogravimetric analysis (TGA) pattern for afurther dried sample of a bis-besylate salt of Compound 1.

FIG. 4 depicts the differential scanning calorimetry (DSC) pattern for abis-besylate salt of Compound 1.

FIG. 5 depicts the infrared (IR) spectrum of a bis-besylate salt ofCompound 1.

FIG. 6 depicts the ¹H-NMR spectrum of a bis-besylate salt of Compound 1.

FIG. 7 depicts the dynamic vapor sorption (DVS) pattern of abis-besylate salt of Compound 1.

FIG. 8 depicts the results of a hydration study of a bis-besylate saltof Compound 1, as analyzed by the XRPD patterns.

FIG. 9 depicts the results of a disproportionation study of abis-besylate salt of Compound 1, as analyzed by the XRPD patterns.

FIG. 10 depicts the results of a stability study of a bis-besylate saltof Compound 1, as analyzed by the XRPD patterns.

FIG. 11 depicts the results of a thermodynamic solubility study of abis-besylate salt of Compound 1, as analyzed by the XRPD patterns.

FIG. 12 depicts the dissolution at pH 4.5 of a compressed disc of abis-besylate salt of Compound 1.

FIG. 13 depicts the dissolution at pH 3.0 of a compressed disc of abis-besylate salt of Compound 1.

FIG. 14 depicts the XRPD pattern for a bis-besylate hydrate salt ofCompound 1.

FIG. 15 depicts the TGA pattern for a bis-besylate hydrate salt ofCompound 1.

FIG. 16 depicts the DSC pattern for a bis-besylate hydrate salt ofCompound 1.

FIG. 17 depicts the IR spectrum of a bis-besylate hydrate salt ofCompound 1.

FIG. 18 depicts the ¹H-NMR spectrum of a bis-besylate hydrate salt ofCompound 1.

FIG. 19 depicts the DVS pattern of a bis-besylate hydrate salt ofCompound 1.

FIG. 20 depicts the results of a stability study of a bis-besylatehydrate salt of Compound 1, as analyzed by the XRPD patterns.

FIG. 21 depicts the results of a thermodynamic solubility study of abis-besylate salt of Compound 1, as analyzed by the XRPD patterns.

FIG. 22 depicts the dissolution at pH 4.5 of a compressed disc of abis-besylate hydrate salt of Compound 1.

FIG. 23 depicts the dissolution at pH 3.0 of a compressed disc of abis-besylate hydrate salt of Compound 1.

FIG. 24 depicts the XRPD pattern for a mono-maleate salt of Compound 1.

FIG. 25 depicts the TGA pattern for a mono-maleate salt of Compound 1.

FIG. 26 depicts the DSC pattern for a mono-maleate salt of Compound 1.

FIG. 27 depicts the ¹H-NMR spectrum of a mono-maleate salt of Compound1.

FIG. 28 depicts the XRPD pattern for a bis-hydrochloride salt ofCompound 1.

FIG. 29 depicts the TGA pattern for a bis-hydrochloride salt of Compound1.

FIG. 30 depicts the DSC pattern for a bis-hydrochloride salt of Compound1.

FIG. 31 depicts the ¹H-NMR spectrum of a bis-hydrochloride salt ofCompound 1.

FIG. 32 depicts the XRPD pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 33 depicts the TGA pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 34 depicts the DSC pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 35 depicts the IR spectrum of a Form I hydrobromide salt ofCompound 1.

FIG. 36 depicts the ¹H-NMR spectrum of a Form I hydrobromide salt ofCompound 1.

FIG. 37 depicts the DVS pattern of a Form I hydrobromide salt ofCompound 1.

FIG. 38 depicts the results of a hydration study of a Form Ihydrobromide salt of Compound 1, as analyzed by the XRPD patterns.

FIG. 39 depicts the results of a disproportionation study of a Form Ihydrobromide salt of Compound 1, as analyzed by the XRPD patterns.

FIG. 40 depicts the results of a stability study of a Form Ihydrobromide salt of Compound 1, as analyzed by the XRPD patterns.

FIG. 41 depicts the results of a thermodynamic solubility study of aForm I hydrobromide salt of Compound 1, as analyzed by the XRPDpatterns.

FIG. 42 depicts the dissolution at pH 4.5 of a compressed disc of a FormI hydrobromide salt of Compound 1.

FIG. 43 depicts the dissolution at pH 3.0 of a compressed disc of a FormI hydrobromide salt of Compound 1.

FIG. 44 depicts the XRPD pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 45 depicts the TGA pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 46 depicts the IR spectrum of a Form I hydrobromide salt ofCompound 1.

FIG. 47 depicts the XRPD pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 48 depicts the ¹H-NMR spectrum for a Form I hydrobromide salt ofCompound 1.

FIG. 49 depicts the DSC pattern of a Form I hydrobromide salt ofCompound 1.

FIG. 50 depicts the results of a slurry experiment involving a form ofthe free base of Compound 1 and a bis-besylate hydrate.

FIG. 51 depicts the results of a slurry experiment involving a Form Ihydrobromide salt of Compound 1 at pH 6.2.

FIG. 52 depicts the XRPD pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 53 depicts the XRPD pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 54 depicts the IR spectrum of a Form I hydrobromide salt ofCompound 1.

FIG. 55 depicts the ¹H-NMR spectrum of a Form I hydrobromide salt ofCompound 1.

FIG. 56 depicts the TGA pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 57 depicts the DSC pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 58 depicts the XRPD pattern for a Form I hydrobromide salt ofCompound 1 after heating.

FIG. 59 depicts the XRPD pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 60 depicts the XRPD pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 61 depicts the IR spectrum of a Form I hydrobromide salt ofCompound 1.

FIG. 62 depicts the ¹H-NMR spectrum of a Form I hydrobromide salt ofCompound 1.

FIG. 63 depicts the TGA pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 64 depicts the DSC pattern for a Form I hydrobromide salt ofCompound 1.

FIG. 65 depicts the results of a thermodynamic solubility study of aForm I hydrobromide salt of Compound 1, as analyzed by the XRPDpatterns.

FIG. 66 depicts the XRPD pattern for a Form I hydrobromide salt ofCompound 1, after storage for 1.5 months.

FIG. 67 depicts the XRPD pattern for a Form III hydrobromide salt ofCompound 1.

FIG. 68 depicts the TGA pattern for a Form III hydrobromide salt ofCompound 1.

FIG. 69 depicts the DSC pattern for a Form III hydrobromide salt ofCompound 1.

FIG. 70 depicts the IR spectrum for a Form III hydrobromide salt ofCompound 1.

FIG. 71 depicts the ¹H-NMR spectrum of a Form III hydrobromide salt ofCompound 1.

FIG. 72 depicts the XRPD pattern for a Form IV hydrobromide salt ofCompound 1.

FIG. 73 depicts the XRPD pattern for a Form V hydrobromide salt ofCompound 1.

FIG. 74 depicts the XRPD pattern for a Form VI hydrobromide salt ofCompound 1.

FIG. 75 depicts the XRPD pattern for a Form VII hydrobromide salt ofCompound 1.

FIG. 76 depicts the XRPD pattern for a Form VIII hydrobromide salt ofCompound 1.

FIG. 77 depicts the TGA pattern for a Form VIII hydrobromide salt ofCompound 1.

FIG. 78 depicts the DSC pattern for a Form VIII hydrobromide salt ofCompound 1.

FIG. 79 depicts the XRPD of an amorphous hydrobromide salt of Compound1.

FIG. 80 depicts the XRPD of Form V hydrobromide salt of Compound 1following desolvation conditions.

FIG. 81 depicts input material Form I hydrobromide salt of Compound 1compared with a wet sample, and after stages of drying.

FIG. 82 depicts the XRPD analysis of hydrobromide salt Forms I and IIIresulting from competitive slurry experiments at ambient temperature(22° C.).

FIG. 83 depicts the XRPD analysis of hydrobromide salt Forms I and IIIresulting from competitive slurry experiments at 60° C.

FIG. 84 depicts the XRPD analysis of Form I hydrobromide salt ofCompound 1 slurried in EtOH:water mixtures.

FIG. 85 depicts the XRPD analysis of material slurried in IPA/acetone(9:1):water mixtures.

FIG. 86 depicts the XRPD analysis following hydration studies at 15° C.and 35° C.

FIG. 87 depicts the form diagram for the hydrobromide salt, including 7different forms and the relationship between such forms.

DETAILED DESCRIPTION OF THE INVENTION General Description of CertainAspects of the Invention:

U.S. application Ser. No. 13/286,061, published as US 2012/0149687 onJun. 14, 2012 (“the '061 application”), filed Oct. 31, 2011, theentirety of which is hereby incorporated herein by reference, describescertain 2,4-disubstituted pyrimidine compounds which covalently andirreversibly inhibit activity of EGFR kinase. Such compounds includecompound 1:

Compound 1(N-(3-(2-(4-(4-acetylpiperazin-1-yl)-2-methoxyphenylamino)-5-(trifluoromethyl)pyrimidin-4-ylamino)phenyl)acrylamide))is designated as compound number I-4 and the synthesis of compound 1 isdescribed in detail at Example 3 of the '061 application.

Compound 1 is active in a variety of assays and therapeutic modelsdemonstrating selective covalent, irreversible inhibition of mutant EGFRkinase (in enzymatic and cellular assays). Notably, compound 1 was foundto inhibit human non-small cell lung cancer cell proliferation both invitro and in vivo. Accordingly, compound 1 and its salts are useful fortreating one or more disorders associated with activity of mutant EGFRkinase.

It would be desirable to provide a form of compound 1 that, as comparedto compound 1, imparts characteristics such as improved aqueoussolubility, stability and ease of formulation. Accordingly, the presentinvention provides several salts of compound 1.

According to one embodiment, the present invention provides a salt ofcompound 1, represented by compound 2:

where:

n is 1 or 2; and

X is benzenesulfonic acid, camphor sulfonic acid, 1,2-ethane disulfonicacid, hydrobromic acid, hydrochloric acid, maleic acid, methanesulfonicacid, naphthalene-2-sulfonic acid, 1,5-naphthalene disulfonic acid,oxalic acid, 4-toluenesulfonic acid or 2,4,6-trihydroxybenzoic acid.

It will be appreciated by one of ordinary skill in the art that the acidmoiety indicated as “X” and compound 1 are ionically bonded to formcompound 2. It is contemplated that compound 2 can exist in a variety ofphysical forms. For example, compound 2 can be in solution, suspension,or in solid form. In certain embodiments, compound 2 is in solid form.When compound 2 is in solid form, said compound may be amorphous,crystalline, or a mixture thereof. Exemplary solid forms are describedin more detail below.

In other embodiments, the present invention provides compound 2substantially free of impurities. As used herein, the term“substantially free of impurities” means that the compound contains nosignificant amount of extraneous matter. Such extraneous matter mayinclude excess acid “X”, excess compound 1, residual solvents, or anyother impurities that may result from the preparation of, and/orisolation of, compound 2. In certain embodiments, at least about 90% byweight of compound 2 is present. In certain embodiments, at least about95% by weight of compound 2 is present. In still other embodiments ofthe invention, at least about 99% by weight of compound 2 is present.

According to one embodiment, compound 2 is present in an amount of atleast about 95, 97, 97.5, 98.0, 98.5, 99, 99.5, 99.8 weight percentwhere the percentages are based on the total weight of the composition.According to another embodiment, compound 2 contains no more than about5.0 area percent HPLC of total organic impurities and, in certainembodiments, no more than about 3.0 area percent HPLC of total organicimpurities and, in certain embodiments, no more than about 1.5 areapercent HPLC total organic impurities relative to the total area of theHPLC chromatogram. In other embodiments, compound 2 contains no morethan about 1.0 area percent HPLC of any single impurity; no more thanabout 0.6 area percent HPLC of any single impurity, and, in certainembodiments, no more than about 0.5 area percent HPLC of any singleimpurity, relative to the total area of the HPLC chromatogram.

The structure depicted for compound 2 is also meant to include alltautomeric forms of compound 2. Additionally, structures depicted hereare also meant to include compounds that differ only in the presence ofone or more isotopically enriched atoms. For example, compounds havingthe present structure except for the replacement of hydrogen bydeuterium or tritium, or the replacement of a carbon by a ¹³C- or¹⁴C-enriched carbon are within the scope of this invention.

Solid Forms of Compound 2:

It has been found that compound 2 can exist in a variety of solid forms.Such forms include polymorphs and amorphous forms. The solid forms canbe solvates, hydrates and unsolvated forms of compound 2. All such formsare contemplated by the present invention. In certain embodiments, thepresent invention provides compound 2 as a mixture of one or more solidforms of compound 2.

As used herein, the term “polymorph” refers to the different crystalstructures (of solvated or unsolvated forms) in which a compound cancrystallize.

As used herein, the term “solvate” refers to a crystal form with eithera stoichiometric or non-stoichiometric amount of solvent. Forpolymorphs, the solvent is incorporated into the crystal structure.Similarly, the term “hydrate” refers to a solid form with either astoichiometric or non-stoichiometric amount of water. For polymorphs,the water is incorporated into the crystal structure.

As used herein, the term “about”, when used in reference to a degree2-theta value refers to the stated value±0.3 degree 2-theta (°2θ). Incertain embodiments, “about” refers to ±0.2 degree 2-theta or ±0.1degree 2-theta.

In certain embodiments, compound 2 is a crystalline solid. In otherembodiments, compound 2 is a crystalline solid substantially free ofamorphous compound 2. As used herein, the term “substantially free ofamorphous compound 2” means that the compound contains no significantamount of amorphous compound 2. In certain embodiments, at least about90% by weight of crystalline compound 2 is present, or at least about95% by weight of crystalline compound 2 is present. In still otherembodiments of the invention, at least about 99% by weight ofcrystalline compound 2 is present.

In certain embodiments, compound 2 is a benzenesulfonic acid (besylate)salt. The salt can be a mono-besylate or a bis-besylate. A besylate saltis optionally solvated or hydrated, such as a monohydrate.

According to one aspect, an unsolvated bis-besylate salt has a powderX-ray diffraction pattern substantially similar to that depicted inFIG. 1. According to one embodiment, an unsolvated bis-besylate salt ischaracterized by one or more peaks in its powder X-ray diffractionpattern selected from those at about 5.62, about 17.41, about 18.90,about 19.07 and about 19.52 degrees 2-theta. In some embodiments, anunsolvated bis-besylate salt is characterized by two or more peaks inits powder X-ray diffraction pattern selected from those at about 5.62,about 17.41, about 18.90, about 19.07 and about 19.52 degrees 2-theta.In certain embodiments, an unsolvated bis-besylate salt is characterizedby three or more peaks in its powder X-ray diffraction pattern selectedfrom those at about 5.62, about 17.41, about 18.90, about 19.07 andabout 19.52 degrees 2-theta. In particular embodiments, an unsolvatedbis-besylate salt is characterized by substantially all of the peaks inits X-ray powder diffraction pattern selected from those at about 5.62,7.89, 11.23, 12.64, 17.41, 18.90, 19.07, 19.52, 22.63, 23.17, 25.28 and28.92 degrees 2-theta. In an exemplary embodiment, an unsolvatedbis-besylate salt is characterized by substantially all of the peaks inits X-ray powder diffraction pattern selected from those at about

°2-Theta 3.37 3.70 5.62 7.00 7.89 8.38 9.56 10.09 10.72 10.91 11.2311.97 12.64 12.98 13.37 14.04 14.56 14.79 15.45 16.08 16.47 16.87 17.4118.40 18.90 19.07 19.52 19.91 20.16 20.50 21.12 21.48 21.95 22.63 23.1723.46 23.82 24.33 24.48 24.93 25.28 25.85 26.18 26.73 27.00 27.63 27.9128.03 28.60 28.92 29.15 29.74 29.94 30.60 31.53 32.13 32.40 32.54 32.7732.96 34.04 35.18 35.61 35.91 36.07 36.54 36.85 37.28 38.25 38.61 39.0639.34 40.20 41.33 41.80 41.88 42.89 43.40 43.80 44.84 45.41 46.34 46.6947.05 47.85 48.75 48.96According to another aspect, an unsolvated bis-besylate salt has athermogravimetric analysis pattern substantially similar to thatdepicted in FIG. 2 or 3. According to yet another aspect, an unsolvatedbis-besylate salt has a differential scanning calorimetry patternsubstantially similar to that depicted in FIG. 4. According to a furtherembodiment, an unsolvated bis-besylate salt has an infrared spectrumsubstantially similar to that depicted in FIG. 5. According to anotherembodiment, an unsolvated bis-besylate salt has an ¹H-NMR spectrumsubstantially similar to that depicted in FIG. 6. According to a furtherembodiment, an unsolvated bis-besylate salt has a dynamic vapoursorption pattern substantially similar to that depicted in FIG. 7. Anunsolvated bis-besylate salt can be characterized by substantialsimilarity to two or more of these figures simultaneously.

According to one aspect, a bis-besylate hydrate has a powder X-raydiffraction pattern substantially similar to that depicted in FIG. 14.According to one embodiment, a bis-besylate hydrate salt ischaracterized by one or more peaks in its powder X-ray diffractionpattern selected from those at about 10.68, about 16.10, about 18.44 andabout 22.36 degrees 2-theta. In some embodiments, a bis-besylate hydratesalt is characterized by two or more peaks in its powder X-raydiffraction pattern selected from those at about 10.68, about 16.10,about 18.44 and about 22.36 degrees 2-theta. In certain embodiments, abis-besylate hydrate salt is characterized by three or more peaks in itspowder X-ray diffraction pattern selected from those at about 10.68,about 16.10, about 18.44 and about 22.36 degrees 2-theta. In particularembodiments, a bis-besylate hydrate salt is characterized bysubstantially all of the peaks in its X-ray powder diffraction patternselected from those at about 9.33, 10.68, 16.10, 16.43, 16.64, 18.44,20.05, 20.32, 20.74, 22.36 and 22.83 degrees 2-theta. In an exemplaryembodiment, a bis-besylate hydrate salt is characterized bysubstantially all of the peaks in its X-ray powder diffraction patternselected from those at about

°2-Theta 3.05 3.30 3.50 3.64 5.31 6.02 6.89 7.77 7.90 8.86 9.33 10.6811.38 11.76 12.19 13.12 13.60 13.95 14.62 16.10 16.43 16.64 17.21 17.6718.06 18.44 18.82 19.45 20.05 20.32 20.74 21.28 22.05 22.36 22.83 23.0423.58 24.09 25.01 25.92 26.51 27.41 27.73 28.03 28.43 28.86 29.20 29.6330.29 30.53 30.92 31.66 32.85 33.22 33.96 34.11 36.94 37.87 39.33 42.6344.95 45.79 46.36 47.16 47.85 48.86 49.09According to another aspect, a bis-besylate hydrate has athermogravimetric analysis pattern substantially similar to thatdepicted in FIG. 15. According to yet another aspect, a bis-besylatehydrate has a differential scanning calorimetry pattern substantiallysimilar to that depicted in FIG. 16. According to a further embodiment,a bis-besylate hydrate has a infrared spectrum substantially similar tothat depicted in FIG. 17. According to another embodiment, abis-besylate hydrate has an ¹H-NMR spectrum substantially similar tothat depicted in FIG. 18. According to a further embodiment, abis-besylate hydrate has a dynamic vapour sorption pattern substantiallysimilar to that depicted in FIG. 19. A bis-besylate hydrate can becharacterized by substantial similarity to two or more of these figuressimultaneously.

In certain embodiments, compound 2 is a camphor sulfonic acid salt(e.g., camphor-10-sulfonic acid). In some embodiments, compound 2 is amono-camphor sulfonic acid salt. In some embodiments, compound 2 is abis-camphor sulfonic acid salt.

In certain embodiments, compound 2 is a 1,2-ethane disulfonic acid salt.In some embodiments, compound 2 is a mono-1,2-ethane disulfonic acidsalt. In some embodiments, compound 2 is a bis-1,2-ethane disulfonicacid salt.

In certain embodiments, compound 2 is a hydrobromic acid salt. In someembodiments, compound 2 is an anhydrous monohydrobromic acid salt. Insome embodiments, compound 2 is an anhydrous bis-hydrobromic acid salt.A hydrobromide salt is optionally solvated or hydrated. In someembodiments, compound 2 is a monohydrate hydrobromic acid salt. In someembodiments, compound 2 is a solvated hydrobromic acid salt. In somesuch embodiments, the solvate is selected from dimethylsulfoxide (DMSO),dimethylformamide (DMF) and 1,4-dioxane. In some embodiments, compound 2is a hydrobromide salt selected from Form I, Form III, Form IV, Form V,Form VI, Form VII and Form VIII, each of which is described in furtherdetail, infra.

In some embodiments, compound 2 is a Form I hydrobromide salt. In somesuch embodiments, compound 2 is an anhydrous Form I hydrobromide salt.According to one aspect, a Form I hydrobromide salt is characterized bythe powder X-ray diffraction pattern substantially similar to thatdepicted in FIG. 60. In some embodiments, a Form I hydrobromide salt ischaracterized by the powder X-ray diffraction pattern substantiallysimilar to that depicted in FIG. 59. According to one embodiment, a FormI mono-hydrobromide salt is characterized by one or more peaks in itspowder X-ray diffraction pattern selected from those at about 17.39,about 19.45, about 21.41, about 23.56 and about 27.45 degrees 2-theta.In some embodiments, a Form I mono-hydrobromide salt is characterized bytwo or more peaks in its powder X-ray diffraction pattern selected fromthose at about 17.39, about 19.45, about 21.41, about 23.56 and about27.45 degrees 2-theta. In certain embodiments, a Form Imono-hydrobromide salt is characterized by three or more peaks in itspowder X-ray diffraction pattern selected from those at about 17.39,about 19.45, about 21.41, about 23.56 and about 27.45 degrees 2-theta.In some embodiments, a Form I mono-hydrobromide salt is characterized byfour or more peaks in its powder X-ray diffraction pattern selected fromthose at about 17.39, about 19.45, about 21.41, about 23.56 and about27.45 degrees 2-theta. In particular embodiments, a Form Imono-hydrobromide salt is characterized by an X-ray powder diffractionpattern which includes the peaks at about 9.84, 15.62, 17.39, 19.45,20.69, 21.41, 22.38, 23.56, 25.08 and 27.45 degrees 2-theta. In anexemplary embodiment, a Form I mono-hydrobromide salt is characterizedby substantially all of the peaks in its X-ray powder diffractionpattern selected from those at about

°2-Theta 3.17 3.48 3.79 5.60 7.92 8.35 9.84 11.52 14.10 15.23 15.6216.73 17.39 18.23 19.45 20.69 21.41 22.38 23.56 24.65 25.08 26.26 27.4528.50 29.06 29.77 29.94 30.66 31.35 32.45 32.82 34.18 34.80 35.35 36.0136.82 37.61 37.96 38.55 39.13 40.04 40.64 40.86 41.03 41.39 42.16 42.4842.78 44.28 45.34 45.59 46.57 47.20 47.51

According to another aspect, a Form I mono-hydrobromide salt ischaracterized by a thermogravimetric analysis pattern substantiallysimilar to that depicted in FIG. 63. According to yet another aspect, aForm I mono-hydrobromide salt is characterized by a differentialscanning calorimetry pattern substantially similar to that depicted inFIG. 64. According to a further embodiment, a Form I mono-hydrobromidesalt is characterized by an infrared spectrum substantially similar tothat depicted in FIG. 61. According to another embodiment, a Form Imono-hydrobromide salt is characterized by a ¹H-NMR spectrumsubstantially similar to that depicted in FIG. 62. In some embodiments,a Form I mono-hydrobromide salt is characterized by substantialsimilarity to two or more of these figures simultaneously.

In some embodiments, compound 2 is a Form III hydrobromide salt. In somesuch embodiments, compound 2 is an anhydrous Form III hydrobromide salt.In some embodiments, a Form III hydrobromide salt is characterized by apowder X-ray diffraction pattern substantially similar to that depictedin FIG. 67. According to one embodiment, a Form III hydrobromide salt ischaracterized by one or more peaks in its powder X-ray diffractionpattern selected from those at about 6.79, about 13.36, about 19.93,about 20.89, about 21.90, about 22.70, about 22.91 and about 26.34degrees 2-theta. In some embodiments, a Form III hydrobromide salt ischaracterized by two or more peaks in its powder X-ray diffractionpattern selected from those at about 6.79, about 13.36, about 19.93,about 20.89, about 21.90, about 22.70, about 22.91 and about 26.34degrees 2-theta. In certain embodiments, a Form III hydrobromide salt ischaracterized by three or more peaks in its powder X-ray diffractionpattern selected from those at about 6.79, about 13.36, about 19.93,about 20.89, about 21.90, about 22.70, about 22.91 and about 26.34degrees 2-theta. In some embodiments, a Form III hydrobromide salt ischaracterized by four or more peaks in its powder X-ray diffractionpattern selected from those at about 6.79, about 13.36, about 19.93,about 20.89, about 21.90, about 22.70, about 22.91 and about 26.34degrees 2-theta. In some embodiments, a Form III hydrobromide salt ischaracterized by five or more peaks in its powder X-ray diffractionpattern selected from those at about 6.79, about 13.36, about 19.93,about 20.89, about 21.90, about 22.70, about 22.91 and about 26.34degrees 2-theta. In some embodiments, a Form III hydrobromide salt ischaracterized by six or more peaks in its powder X-ray diffractionpattern selected from those at about 6.79, about 13.36, about 19.93,about 20.89, about 21.90, about 22.70, about 22.91 and about 26.34degrees 2-theta. In particular embodiments, a Form III hydrobromide saltis characterized by an X-ray powder diffraction pattern which includesthe peaks at about 6.79, about 13.36, about 19.93, about 20.89, about21.90, about 22.70, about 22.91 and about 26.34 degrees 2-theta. In anexemplary embodiment, a Form III hydrobromide salt is characterized bysubstantially all of the peaks in its X-ray powder diffraction patternselected from those at about

°2-Theta 6.79 8.15 8.98 9.58 10.36 11.35 13.36 14.06 14.58 15.99 16.6717.08 17.84 18.33 18.74 19.07 19.93 20.89 21.90 22.70 22.91 23.93 24.3225.39 25.74 26.34 27.47 28.32 28.89 30.50 30.76 31.39 31.75 32.39 32.6833.33 33.77 34.48 34.57

In some embodiments, a Form III hydrobromide salt is characterized by athermogravimetric analysis pattern substantially similar to thatdepicted in FIG. 68. In some embodiments, a Form III hydrobromide saltis characterized by a differential scanning calorimetry patternsubstantially similar to that depicted in FIG. 69. In some embodiments,a Form III hydrobromide salt is characterized by an infrared spectrumsubstantially similar to that depicted in FIG. 70. In some embodiments,a Form III hydrobromide salt is characterized by a ¹H-NMR spectrumsubstantially similar to that depicted in FIG. 71. In some embodiments,a Form III hydrobromide salt is characterized by substantial similarityto two or more of these figures simultaneously.

In some embodiments, compound 2 is a Form IV hydrobromide salt. In somesuch embodiments, a Form IV hydrobromide salt is a 1,4-dioxane solvate.In some embodiments, a Form IV hydrobromide salt is characterized by apowder X-ray diffraction pattern substantially similar to that depictedin FIG. 72. According to one embodiment, a Form IV hydrobromide salt ischaracterized by one or more peaks in its powder X-ray diffractionpattern selected from those at about 6.45, about 12.96, about 19.38,about 19.79, about 21.37 and about 21.58 degrees 2-theta. In someembodiments, a Form IV hydrobromide salt is characterized by two or morepeaks in its powder X-ray diffraction pattern selected from those atabout 6.45, about 12.96, about 19.38, about 19.79, about 21.37 and about21.58 degrees 2-theta. In certain embodiments, a Form IV hydrobromidesalt is characterized by three or more peaks in its powder X-raydiffraction pattern selected from those at about 6.45, about 12.96,about 19.38, about 19.79, about 21.37 and about 21.58 degrees 2-theta.In some embodiments, a Form IV hydrobromide salt is characterized byfour or more peaks in its powder X-ray diffraction pattern selected fromthose at about 6.45, about 12.96, about 19.38, about 19.79, about 21.37and about 21.58 degrees 2-theta. In some embodiments, a Form IVhydrobromide salt is characterized by five or more peaks in its powderX-ray diffraction pattern selected from those at about 6.45, about12.96, about 19.38, about 19.79, about 21.37 and about 21.58 degrees2-theta. In particular embodiments, a Form IV hydrobromide salt ischaracterized by an X-ray powder diffraction pattern which includes thepeaks at about 6.45, about 12.96, about 19.38, about 19.79, about 21.37and about 21.58 degrees 2-theta. In an exemplary embodiment, a Form IVhydrobromide salt is characterized by substantially all of the peaks inits X-ray powder diffraction pattern selected from those at about

°2-Theta 5.99 6.45 7.23 7.84 9.31 9.71 11.07 12.96 13.42 16.34 16.5517.00 17.93 18.99 19.38 19.79 21.37 21.58 22.65 23.23 24.10 24.82 26.53927.12 27.89 28.43 28.74

In some embodiments, compound 2 is a Form V hydrobromide salt. In somesuch embodiments, a Form V hydrobromide salt is a N,N-dimethylformamide(DMF) solvate. In some embodiments, a Form V hydrobromide salt ischaracterized by a powder X-ray diffraction pattern substantiallysimilar to that depicted in FIG. 73. According to one embodiment, a FormV hydrobromide salt is characterized by one or more peaks in its powderX-ray diffraction pattern selected from those at about 6.17, about 6.99,about 12.50, about 14.14, about 17.72 and about 23.12 degrees 2-theta.In some embodiments, a Form V hydrobromide salt is characterized by twoor more peaks in its powder X-ray diffraction pattern selected fromthose at about 6.17, about 6.99, about 12.50, about 14.14, about 17.72and about 23.12 degrees 2-theta. In certain embodiments, a Form Vhydrobromide salt is characterized by three or more peaks in its powderX-ray diffraction pattern selected from those at about 6.17, about 6.99,about 12.50, about 14.14, about 17.72 and about 23.12 degrees 2-theta.In some embodiments, a Form V hydrobromide salt is characterized by fouror more peaks in its powder X-ray diffraction pattern selected fromthose at about 6.17, about 6.99, about 12.50, about 14.14, about 17.72and about 23.12 degrees 2-theta. In some embodiments, a Form Vhydrobromide salt is characterized by five or more peaks in its powderX-ray diffraction pattern selected from those at about 6.17, about 6.99,about 12.50, about 14.14, about 17.72 and about 23.12 degrees 2-theta.In particular embodiments, a Form V hydrobromide salt is characterizedby an X-ray powder diffraction pattern which includes the peaks at about6.17, about 6.99, about 12.50, about 14.14, about 17.72 and about 23.12degrees 2-theta. In an exemplary embodiment, a Form V hydrobromide saltis characterized by substantially all of the peaks in its X-ray powderdiffraction pattern selected from those at about

°2-Theta 6.17 6.99 8.76 12.50 13.56 14.14 15.19 17.03 17.72 20.20 21.0621.38 21.66 21.90 22.33 22.70 23.12 23.41 23.66 23.88 24.16 24.57 25.1525.41 26.64 26.97 28.12 28.42 28.61

In some embodiments, compound 2 is a Form VI hydrobromide salt. In somesuch embodiments, a Form VI hydrobromide salt is a dimethylsulfoxide(DMSO) solvate. In some embodiments, a Form VI hydrobromide salt ischaracterized by a powder X-ray diffraction pattern substantiallysimilar to that depicted in FIG. 74. According to one embodiment, a FormVI hydrobromide salt is characterized by one or more peaks in its powderX-ray diffraction pattern selected from those at about 8.38, about 9.38,about 18.93, and about 21.58 degrees 2-theta. In some embodiments, aForm VI hydrobromide salt is characterized by two or more peaks in itspowder X-ray diffraction pattern selected from those at about 8.38,about 9.38, about 18.93, and about 21.58 degrees 2-theta. In certainembodiments, a Form VI hydrobromide salt is characterized by three ormore peaks in its powder X-ray diffraction pattern selected from thoseat about 8.38, about 9.38, about 18.93, and about 21.58 degrees 2-theta.In particular embodiments, a Form VI hydrobromide salt is characterizedby an X-ray powder diffraction pattern which includes the peaks at about8.38, about 9.38, about 18.93, and about 21.58 degrees 2-theta. In anexemplary embodiment, a Form VI hydrobromide salt is characterized bysubstantially all of the peaks in its X-ray powder diffraction patternselected from those at about

°2-Theta 8.38 9.38 18.93 21.58

In some embodiments, compound 2 is a Form VII hydrobromide salt. In somesuch embodiments, a Form VII hydrobromide salt is a dimethylsulfoxide(DMSO) solvate. In some embodiments, a Form VII hydrobromide salt ischaracterized by a powder X-ray diffraction pattern substantiallysimilar to that depicted in FIG. 75. According to one embodiment, a FormVII hydrobromide salt is characterized by one or more peaks in itspowder X-ray diffraction pattern selected from those at about 15.91,about 19.10, about 19.53, about 20.24, about 22.64 and about 25.58degrees 2-theta. In some embodiments, a Form VII hydrobromide salt ischaracterized by two or more peaks in its powder X-ray diffractionpattern selected from those at about 15.91, about 19.10, about 19.53,about 20.24, about 22.64 and about 25.58 degrees 2-theta. In certainembodiments, a Form VII hydrobromide salt is characterized by three ormore peaks in its powder X-ray diffraction pattern selected from thoseat about 15.91, about 19.10, about 19.53, about 20.24, about 22.64 andabout 25.58 degrees 2-theta. In some embodiments, a Form VIIhydrobromide salt is characterized by four or more peaks in its powderX-ray diffraction pattern selected from those at about 15.91, about19.10, about 19.53, about 20.24, about 22.64 and about 25.58 degrees2-theta. In some embodiments, a Form VII hydrobromide salt ischaracterized by five or more peaks in its powder X-ray diffractionpattern selected from those at about 15.91, about 19.10, about 19.53,about 20.24, about 22.64 and about 25.58 degrees 2-theta. In particularembodiments, a Form VII hydrobromide salt is characterized by an X-raypowder diffraction pattern which includes the peaks at about 15.91,about 19.10, about 19.53, about 20.24, about 22.64 and about 25.58degrees 2-theta. In an exemplary embodiment, a Form VII hydrobromidesalt is characterized by substantially all of the peaks in its X-raypowder diffraction pattern selected from those at about

°2-Theta 6.35 8.88 9.29 15.18 15.91 16.54 16.88 17.56 18.22 19.10 19.5320.24 21.78 22.12 22.64 23.93 24.37 25.00 25.58 26.00

In some embodiments, compound 2 is a Form VIII hydrobromide salt. Insome such embodiments, a Form VIII hydrobromide salt is a hydrate. Insome embodiments, a Form VIII hydrobromide salt is characterized by apowder X-ray diffraction pattern substantially similar to that depictedin FIG. 76. According to one embodiment, a Form VIII hydrobromide saltis characterized by one or more peaks in its powder X-ray diffractionpattern selected from those at about 8.79, about 11.13, about 19.97,about 21.31, about 21.56, about 25.30 and about 26.65 degrees 2-theta.In some embodiments, a Form VIII hydrobromide salt is characterized bytwo or more peaks in its powder X-ray diffraction pattern selected fromthose at about 8.79, about 11.13, about 19.97, about 21.31, about 21.56,about 25.30 and about 26.65 degrees 2-theta. In certain embodiments, aForm VIII hydrobromide salt is characterized by three or more peaks inits powder X-ray diffraction pattern selected from those at about 8.79,about 11.13, about 19.97, about 21.31, about 21.56, about 25.30 andabout 26.65 degrees 2-theta. In some embodiments, a Form VIIIhydrobromide salt is characterized by four or more peaks in its powderX-ray diffraction pattern selected from those at about 8.79, about11.13, about 19.97, about 21.31, about 21.56, about 25.30 and about26.65 degrees 2-theta. In some embodiments, a Form VIII hydrobromidesalt is characterized by five or more peaks in its powder X-raydiffraction pattern selected from those at about 8.79, about 11.13,about 19.97, about 21.31, about 21.56, about 25.30 and about 26.65degrees 2-theta. In some embodiments, a Form VIII hydrobromide salt ischaracterized by six or more peaks in its powder X-ray diffractionpattern selected from those at about 8.79, about 11.13, about 19.97,about 21.31, about 21.56, about 25.30 and about 26.65 degrees 2-theta.In particular embodiments, a Form VIII hydrobromide salt ischaracterized by an X-ray powder diffraction pattern which includes thepeaks at about 8.79, about 11.13, about 19.97, about 21.31, about 21.56,about 25.30 and about 26.65 degrees 2-theta. In an exemplary embodiment,a Form VIII hydrobromide salt is characterized by substantially all ofthe peaks in its X-ray powder diffraction pattern selected from those atabout

°2-Theta 8.79 9.00 10.22 11.13 13.15 13.30 13.65 17.19 17.65 18.07 18.6919.09 19.97 20.75 21.05 21.31 21.56 23.12 23.71 24.00 24.82 25.30 25.7126.34 26.65 27.17 28.18 28.97 29.31 29.96 30.65 31.23 31.64 34.21 34.43

In some embodiments, a Form VIII hydrobromide salt has athermogravimetric analysis pattern substantially similar to thatdepicted in FIG. 77. In some embodiments, a Form VIII hydrobromide salthas a differential scanning calorimetry pattern substantially similar tothat depicted in FIG. 78. In some embodiments, a Form VIII hydrobromidesalt is characterized by substantial similarity to two or more of thesefigures simultaneously.

In certain embodiments, compound 2 is a hydrochloric acid salt. In someembodiments, compound 2 is a mono-hydrochloric acid salt. In someembodiments, compound 2 is a bis-hydrochloric acid salt.

According to one aspect, a bis-hydrochloride salt has a powder X-raydiffraction pattern substantially similar to that depicted in FIG. 28.According to one embodiment, a bis-hydrochloride salt is characterizedby one or more peaks in its powder X-ray diffraction pattern selectedfrom those at about 17.58, about 23.32, about 25.53 and about 28.37degrees 2-theta. In some embodiments, a bis-hydrochloride salt ischaracterized by two or more peaks in its powder X-ray diffractionpattern selected from those at about 17.58, about 23.32, about 25.53 andabout 28.37 degrees 2-theta. In certain embodiments, a bis-hydrochloridesalt is characterized by three or more peaks in its powder X-raydiffraction pattern selected from those at about 17.58, about 23.32,about 25.53 and about 28.37 degrees 2-theta. In particular embodiments,a bis- hydrochloride salt is characterized by substantially all of thepeaks in its X-ray powder diffraction pattern selected from those atabout 17.58, 20.13, 22.14, 23.32, 25.53, 26.60, 27.80 and 28.37 degrees2-theta. In an exemplary embodiment, a bis-hydrochloride salt ischaracterized by substantially all of the peaks in its X-ray powderdiffraction pattern selected from those at about

°2-Theta 3.04 3.84 5.40 6.34 7.67 9.20 9.37 10.62 14.48 15.34 15.4715.81 16.34 16.87 17.58 18.44 19.68 20.13 20.86 21.38 21.67 22.14 23.3223.99 24.63 25.15 25.53 26.60 27.80 28.37 28.73 29.08 29.50 30.21 30.7431.56 31.79 32.29 33.03 33.46 34.66 35.62 36.07 36.47 37.08 37.91 38.7140.02 41.01 41.78 42.64 44.43 44.89 45.62 46.46 46.87 47.18 47.88 48.1448.72 49.63According to another aspect, a bis-hydrochloride salt has athermogravimetric analysis pattern substantially similar to thatdepicted in FIG. 29. According to yet another aspect, abis-hydrochloride salt has a differential scanning calorimetry patternsubstantially similar to that depicted in FIG. 30. According to anotherembodiment, a bis-hydrochloride salt has an ¹H-NMR spectrumsubstantially similar to that depicted in FIG. 31.

In certain embodiments, compound 2 is a maleic acid salt. In someembodiments, compound 2 is a mono-maleic acid salt. In some embodiments,compound 2 is a bis-maleic acid salt.

According to one aspect, a mono-maleate salt has a powder X-raydiffraction pattern substantially similar to that depicted in FIG. 24.According to one embodiment, a mono-maleate salt is characterized by oneor more peaks in its powder X-ray diffraction pattern selected fromthose at about 8.38, about 23.59 and about 23.80 degrees 2-theta. Insome embodiments, a mono-maleate salt is characterized by two or morepeaks in its powder X-ray diffraction pattern selected from those atabout 8.38, about 23.59 and about 23.80 degrees 2-theta. In certainembodiments, a mono-maleate salt is characterized by three peaks in itspowder X-ray diffraction pattern selected from those at about 8.38,about 23.59 and about 23.80 degrees 2-theta. In particular embodiments,a mono-maleate salt is characterized by substantially all of the peaksin its X-ray powder diffraction pattern selected from those at about8.38, 13.74, 16.35, 16.54, 20.67, 23.15, 23.59 and 23.80 degrees2-theta. In an exemplary embodiment, a mono-maleate salt ischaracterized by substantially all of the peaks in its X-ray powderdiffraction pattern selected from those at about

°2-Theta 7.42 8.38 9.06 9.91 10.13 10.45 10.62 11.16 12.40 13.15 13.7414.65 15.91 16.35 16.54 17.86 19.96 20.67 22.50 23.15 23.59 23.80 24.7526.52 27.13 27.90 29.53 30.37 31.30 32.04 33.68 35.05 38.51 41.05 43.0345.85 46.06 46.44 46.69 48.23According to another aspect, a mono-maleate salt has a thermogravimetricanalysis pattern substantially similar to that depicted in FIG. 25.According to yet another aspect, a mono-maleate salt has a differentialscanning calorimetry pattern substantially similar to that depicted inFIG. 26. According to another embodiment, a mono-maleate salt has an¹H-NMR spectrum substantially similar to that depicted in FIG. 27.

It will be appreciated that any of the above-described polymorph formscan be characterized, for example, by reference to any of the peaks intheir respective X-ray diffraction patterns. Accordingly, in someembodiments, a polymorph described herein is characterized by one, two,three, four, five, six, seven, eight, nine, ten, eleven, twelve,thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen,twenty or more XRPD peaks (°2θ).

In certain embodiments, compound 2 is a methanesulfonic acid salt. Insome embodiments, compound 2 is a mono-methansulfonic acid salt. In someembodiments, compound 2 is a bis-methanesulfonic acid salt.

In certain embodiments, compound 2 is a naphthalene-2-sulfonic acidsalt. In some embodiments, compound 2 is a mono-naphthalene-2-sulfonicacid salt. In some embodiments, compound 2 is abis-naphthalene-2-sulfonic acid salt.

In certain embodiments, compound 2 is a 1,5-naphthalene disulfonic acidsalt. In some embodiments, compound 2 is a mono-1,5-naphthalenedisulfonic acid salt. In some embodiments, compound 2 is abis-1,5-naphthalene disulfonic acid salt.

In certain embodiments, compound 2 is an oxalic acid salt. In someembodiments, compound 2 is a mono-oxalic acid salt. In some embodiments,compound 2 is a bis-oxalic acid salt.

In certain embodiments, compound 2 is a p-toluenesulfonic acid(tosylate) salt. In some embodiments, compound 2 is amono-p-toluenesulfonic acid salt. In some embodiments, compound 2 is abis-p-toluenesulfonic acid salt.

In certain embodiments, compound 2 is a 2,4,6-trihydroxybenzoic acidsalt. In some embodiments, compound 2 is a mono-2,4,6-trihydroxybenzoicacid salt. In some embodiments, compound 2 is abis-2,4,6-trihydroxybenzoic acid salt.

According to another embodiment, the present invention provides compound2 as an amorphous solid. Amorphous solids are well known to one ofordinary skill in the art and are typically prepared by such methods aslyophilization, melting, and precipitation from supercritical fluid,among others.

General Methods of Providing Compound 2:

Compound 1 is prepared according to the methods described in detail inthe '061 application, the entirety of which is hereby incorporatedherein by reference. Compound 2 is prepared from Compound 1, accordingto the Scheme below.

As depicted in the general Scheme above, Compound 2 is prepared fromCompound 1 by combining Compound 1 with either one or two equivalents ofbenzenesulfonic acid, camphor sulfonic acid, 1,2-ethane disulfonic acid,hydrobromic acid, hydrochloric acid, maleic acid, methanesulfonic acid,naphthalene-2-sulfonic acid, 1,5-naphthalene disulfonic acid, oxalicacid, 4-toluenesulfonic acid or 2,4,6-trihydroxybenzoic acid to form thesalt thereof. Thus, another aspect of the present invention provides amethod for preparing Compound 2:

comprising the steps of:

providing Compound 1:

combining Compound 1 with one or two equivalents of benzenesulfonicacid, camphor sulfonic acid, 1,2-ethane disulfonic acid, hydrobromicacid, hydrochloric acid, maleic acid, methanesulfonic acid,naphthalene-2-sulfonic acid, 1,5-naphthalene disulfonic acid, oxalicacid, 4-toluenesulfonic acid or 2,4,6-trihydroxybenzoic acid in asuitable solvent; and

optionally isolating Compound 2.

A suitable solvent may solubilize one or more of the reactioncomponents, or, alternatively, the suitable solvent may facilitate theagitation of a suspension of one or more of the reaction components.Examples of suitable solvents useful in the present invention are aprotic solvent, a polar aprotic solvent, a nonpolar solvent or mixturesthereof. In certain embodiments, suitable solvents include water, anether, an ester, an alcohol, a halogenated solvent, a ketone, or amixture thereof. In certain embodiments, the suitable solvent ismethanol, ethanol, isopropanol, ethyl acetate, isopropyl acetate, methylethyl ketone, methyl isobutyl ketone or acetone. In certain embodiments,the suitable solvent is dichloromethane. In other embodiments, suitablesolvents include tetrahydrofuran, dimethylformamide, dimethylsulfoxide,glyme, diglyme, methyl t-butyl ether, t-butanol, n-butanol, andacetonitrile. In some embodiments, the suitable solvent is cyclohexane.

According to another embodiment, the present invention provides a methodfor preparing Compound 2:

comprising the steps of:

combining Compound 1:

with a suitable solvent and optionally heating to form a solutionthereof;

adding one or two equivalents of benzenesulfonic acid, camphor sulfonicacid, 1,2-ethane disulfonic acid, hydrobromic acid, hydrochloric acid,maleic acid, methanesulfonic acid, naphthalene-2-sulfonic acid,1,5-naphthalene disulfonic acid, oxalic acid, 4-toluenesulfonic acid or2,4,6-trihydroxybenzoic acid to said solution; and

optionally isolating Compound 2.

As described generally above, Compound 1 is dissolved or suspended in asuitable solvent, optionally with heating. In certain embodimentsCompound 1 is dissolved at about 20 to about 60° C. In otherembodiments, Compound 1 is dissolved at about 20 to about 25° C., suchas about ambient temperature. In still other embodiments, compound 1 isdissolved at the boiling temperature of the solvent. In otherembodiments, compound 1 is dissolved without heating.

In certain embodiments, about 1 equivalent of benzenesulfonic acid,camphor sulfonic acid, 1,2-ethane disulfonic acid, hydrobromic acid,hydrochloric acid, maleic acid, methanesulfonic acid,naphthalene-2-sulfonic acid, 1,5-naphthalene disulfonic acid, oxalicacid, 4-toluenesulfonic acid or 2,4,6-trihydroxybenzoic acid is added toCompound 1 to afford Compound 2. In other embodiments, about 2equivalents of benzenesulfonic acid, camphor sulfonic acid, 1,2-ethanedisulfonic acid, hydrobromic acid, hydrochloric acid, maleic acid,methanesulfonic acid, naphthalene-2-sulfonic acid, 1,5-naphthalenedisulfonic acid, oxalic acid, 4-toluenesulfonic acid or2,4,6-trihydroxybenzoic acid is added to Compound 1 to afford Compound2. In yet other embodiments, greater than 2 equivalents ofbenzenesulfonic acid, camphor sulfonic acid, 1,2-ethane disulfonic acid,hydrobromic acid, hydrochloric acid, maleic acid, methanesulfonic acid,naphthalene-2-sulfonic acid, 1,5-naphthalene disulfonic acid, oxalicacid, 4-toluenesulfonic acid or 2,4,6-trihydroxybenzoic acid is added toCompound 1 to afford Compound 2. In still other embodiments, about 0.9to about 1.1 equivalents of benzenesulfonic acid, camphor sulfonic acid,1,2-ethane disulfonic acid, hydrobromic acid, hydrochloric acid, maleicacid, methanesulfonic acid, naphthalene-2-sulfonic acid, 1,5-naphthalenedisulfonic acid, oxalic acid, 4-toluenesulfonic acid or2,4,6-trihydroxybenzoic acid is added to Compound 1 to afford Compound2. In another embodiment, about 0.99 to about 1.01 equivalents ofbenzenesulfonic acid, camphor sulfonic acid, 1,2-ethane disulfonic acid,hydrobromic acid, hydrochloric acid, maleic acid, methanesulfonic acid,naphthalene-2-sulfonic acid, 1,5-naphthalene disulfonic acid, oxalicacid, 4-toluenesulfonic acid or 2,4,6-trihydroxybenzoic acid is added toCompound 1 to afford Compound 2. In further embodiments, about 1.8 toabout 2.2 equivalents, such as about 1.98 to 2.02 equivalents, ofbenzenesulfonic acid, camphor sulfonic acid, 1,2-ethane disulfonic acid,hydrobromic acid, hydrochloric acid, maleic acid, methanesulfonic acid,naphthalene-2-sulfonic acid, 1,5-naphthalene disulfonic acid, oxalicacid, 4-toluenesulfonic acid or 2,4,6-trihydroxybenzoic acid is added toCompound 1 to afford Compound 2.

It will be appreciated that the acid may be added to the mixture ofCompound 1 and a suitable solvent in any suitable form. For example, theacid may be added in solid form or as a solution or a suspension in asuitable solvent. The suitable solvent may be the same suitable solventas that which is combined with Compound 1 or may be a different solvent.According to one embodiment, the acid is added in solid form. In certainembodiments, the acid is combined with a suitable solvent prior toadding to Compound 1. According to another embodiment, the acid is addedas a solution in a suitable solvent. In certain embodiments, suitablesolvents include water, an ether, an ester, an alcohol, a halogenatedsolvent, a ketone, or a mixture thereof. In certain embodiments, thesuitable solvent is methanol, ethanol, isopropanol, ethyl acetate,isopropyl acetate, methyl ethyl ketone, methyl isobutyl ketone oracetone. In certain embodiments, the suitable solvent isdichloromethane. In other embodiments, suitable solvents includetetrahydrofuran, dimethylformamide, dimethylsulfoxide, glyme, diglyme,methyl t-butyl ether, t-butanol, n-butanol, and acetonitrile. In someembodiments, the suitable solvent is cyclohexane. In certain embodimentsthe suitable solvent is selected from those above and is anhydrous.

In certain embodiments, the resulting mixture containing Compound 2 iscooled. In other embodiments, the mixture containing Compound 2 iscooled below 20° C., such as below 10° C.

In certain embodiments, Compound 2 precipitates from the mixture. Inanother embodiment, Compound 2 crystallizes from the mixture. In otherembodiments, Compound 2 crystallizes from solution following seeding ofthe solution (i.e., adding crystals of Compound 2 to the solution).

Crystalline Compound 2 can precipitate out of the reaction mixture, orbe generated by removal of part or all of the solvent through methodssuch as evaporation, distillation, filtration (e.g., nanofiltration,ultrafiltration), reverse osmosis, absorption and reaction, by adding ananti-solvent such as water, MTBE or heptane, by cooling or by differentcombinations of these methods.

As described generally above, Compound 2 is optionally isolated. It willbe appreciated that Compound 2 may be isolated by any suitable physicalmeans known to one of ordinary skill in the art. In certain embodiments,precipitated solid compound 2 is separated from the supernatant byfiltration. In other embodiments, precipitated solid Compound 2 isseparated from the supernatant by decanting the supernatant.

In certain embodiments, precipitated solid Compound 2 is separated fromthe supernatant by filtration.

In certain embodiments, isolated Compound 2 is dried in air. In otherembodiments isolated Compound 2 is dried under reduced pressure,optionally at elevated temperature.

Uses, Formulation and Administration Pharmaceutically AcceptableCompositions

According to another embodiment, the invention provides a compositioncomprising Compound 2 and a pharmaceutically acceptable carrier,adjuvant, or vehicle. The amount of Compound 2 in compositions of thisinvention it is such that is effective to measurably inhibit a proteinkinase, particularly an EGFR kinase, or a mutant thereof, in abiological sample or in a patient. In certain embodiments, a compositionof this invention is formulated for administration to a patient in needof such composition. In some embodiments, a composition of thisinvention is formulated for oral administration to a patient.

The term “patient”, as used herein, means an animal, preferably amammal, and most preferably a human.

The term “pharmaceutically acceptable carrier, adjuvant, or vehicle”refers to a non-toxic carrier, adjuvant, or vehicle that does notdestroy the pharmacological activity of the compound with which it isformulated. Pharmaceutically acceptable carriers, adjuvants or vehiclesthat may be used in the compositions of this invention include, but arenot limited to, ion exchangers, alumina, aluminum stearate, lecithin,serum proteins, such as human serum albumin, buffer substances such asphosphates, glycine, sorbic acid, potassium sorbate, partial glyceridemixtures of saturated vegetable fatty acids, water, salts orelectrolytes, such as protamine sulfate, disodium hydrogen phosphate,potassium hydrogen phosphate, sodium chloride, zinc salts, colloidalsilica, magnesium trisilicate, polyvinyl pyrrolidone, cellulose-basedsubstances, polyethylene glycol, Vitamin E polyethylene glycol succinate(d-alpha tocopheryl polyethylene glycol 1000 succinate), sodiumcarboxymethylcellulose, polyacrylates, waxes,polyethylene-polyoxypropylene-block polymers, gelatine, polyvinylpyrrolidone vinyl acetate, hydroxypropyl methyl cellulose, madnesiumstearate, steric acid, citric acid, mannitol, and wool fat.

Compositions of the present invention may be administered orally,parenterally, by inhalation spray, topically, rectally, nasally,buccally, vaginally or via an implanted reservoir. The term “parenteral”as used herein includes subcutaneous, intravenous, intramuscular,intra-articular, intra-synovial, intrasternal, intrathecal,intrahepatic, intralesional and intracranial injection or infusiontechniques. Preferably, the compositions are administered orally,intraperitoneally or intravenously. Sterile injectable forms of thecompositions of this invention may be an aqueous or oleaginoussuspension. These suspensions may be formulated according to techniquesknown in the art using suitable dispersing or wetting agents andsuspending agents. The sterile injectable preparation may also be asterile injectable solution or suspension in a non-toxic parenterallyacceptable diluent or solvent, for example as a solution in1,3-butanediol. Among the acceptable vehicles and solvents that may beemployed are water, Ringer's solution and isotonic sodium chloridesolution. In addition, sterile, fixed oils are conventionally employedas a solvent or suspending medium.

For this purpose, any bland fixed oil may be employed includingsynthetic mono- or di-glycerides. Fatty acids, such as oleic acid andits glyceride derivatives are useful in the preparation of injectables,as are natural pharmaceutically-acceptable oils, such as olive oil orcastor oil, especially in their polyoxyethylated versions. These oilsolutions or suspensions may also contain a long-chain alcohol diluentor dispersant, such as carboxymethyl cellulose or similar dispersingagents that are commonly used in the formulation of pharmaceuticallyacceptable dosage forms including emulsions and suspensions. Othercommonly used surfactants, such as Tweens, Spans and other emulsifyingagents or bioavailability enhancers which are commonly used in themanufacture of pharmaceutically acceptable solid, liquid, or otherdosage forms may also be used for the purposes of formulation.

Pharmaceutically acceptable compositions of this invention may be orallyadministered in any orally acceptable dosage form including, but notlimited to, capsules, tablets, aqueous and non-aqueous suspensions orsolutions. In the case of tablets for oral use, carriers commonly usedinclude lactose and corn starch. Lubricating agents, such as magnesiumstearate, are also typically added. For oral administration in a capsuleform, useful diluents include lactose and dried cornstarch. When aqueoussuspensions are required for oral use, the active ingredient istypically combined with emulsifying and suspending agents. If desired,certain sweetening, flavoring or coloring agents may also be added.

Alternatively, pharmaceutically acceptable compositions of thisinvention may be administered in the form of suppositories for rectaladministration. These can be prepared by mixing the agent with asuitable non-irritating excipient that is solid at room temperature butliquid at rectal temperature and therefore will melt in the rectum torelease the drug. Such materials include cocoa butter, beeswax andpolyethylene glycols.

Pharmaceutically acceptable compositions of this invention may also beadministered topically, especially when the target of treatment includesareas or organs readily accessible by topical application, includingdiseases of the eye, the skin, or the lower intestinal tract. Suitabletopical formulations are readily prepared for each of these areas ororgans.

Topical application for the lower intestinal tract can be effected in arectal suppository formulation (see above) or in a suitable enemaformulation. Topically-transdermal patches may also be used.

For topical applications, provided pharmaceutically acceptablecompositions may be formulated in a suitable ointment containing theactive component suspended or dissolved in one or more carriers.Carriers for topical administration of Compound 2 include, but are notlimited to, mineral oil, liquid petrolatum, white petrolatum, propyleneglycol, polyoxyethylene, polyoxypropylene compound, emulsifying wax andwater. Alternatively, provided pharmaceutically acceptable compositionscan be formulated in a suitable lotion or cream containing the activecomponents suspended or dissolved in one or more pharmaceuticallyacceptable carriers. Suitable carriers include, but are not limited to,mineral oil, sorbitan monostearate, polysorbate 60, cetyl esters wax,cetearyl alcohol, 2-octyldodecanol, benzyl alcohol and water.

For ophthalmic use, provided pharmaceutically acceptable compositionsmay be formulated as micronized suspensions in isotonic, pH adjustedsterile saline, or, preferably, as solutions in isotonic, pH adjustedsterile saline, either with or without a preservative such asbenzylalkonium chloride. Alternatively, for ophthalmic uses, thepharmaceutically acceptable compositions may be formulated in anointment such as petrolatum.

Pharmaceutically acceptable compositions of this invention may also beadministered by nasal aerosol or inhalation. Such compositions areprepared according to techniques well-known in the art of pharmaceuticalformulation and may be prepared as solutions in saline, employing benzylalcohol or other suitable preservatives, absorption promoters to enhancebioavailability, fluorocarbons, and/or other conventional solubilizingor dispersing agents.

In some embodiments, pharmaceutically acceptable compositions of thisinvention are formulated for oral administration.

The amount of Compound 2 that may be combined with the carrier materialsto produce a composition in a single dosage form will vary dependingupon the host treated, the particular mode of administration. In certainembodiments, provided compositions are formulated so that a dosage ofbetween 0.01-100 mg/kg body weight/day of Compound 2 can be administeredto a patient receiving these compositions.

It should also be understood that a specific dosage and treatmentregimen for any particular patient will depend upon a variety offactors, including the activity of the specific compound employed, theage, body weight, general health, sex, diet, time of administration,rate of excretion, drug combination, and the judgment of the treatingphysician and the severity of the particular disease being treated.

Uses of Compounds and Pharmaceutically Acceptable Compositions

Compound 2 and compositions described herein are generally useful forthe inhibition of protein kinase activity of one or more enzymes.Examples of kinases that are inhibited by Compound 2 and compositionsdescribed herein and against which the methods described herein areuseful include EGFR kinase or a mutant thereof. It has been found thatCompound 2 is a selective inhibitor of at least one mutation of EGFR, ascompared to wild-type (“WT”) EGFR. In certain embodiments, an at leastone mutation of EGFR is T790M. In certain embodiments, the at least onemutation of EGFR is a deletion mutation. In some embodiments, the atleast one mutation of EGFR is an activating mutation. In certainembodiments, Compound 2 selectively inhibits at least one resistantmutation and at least one activating mutation as compared to WT EGFR. Insome embodiments, Compound 2 selectively inhibits at least one deletionmutation and/or at least one point mutation, and is sparing as to WTEGFR inhibition.

A mutation of EGFR can be selected from T790M (resistant or oncogenic),L858R (activating), delE746-A750 (activating), G719S (activating), or acombination thereof.

As used herein, the term “selectively inhibits,” as used in comparisonto inhibition of WT EGFR, means that Compound 2 inhibits at least onemutation of EGFR (i.e., at least one deletion mutation, at least oneactivating mutation, at least one resistant mutation, or a combinationof at least one deletion mutation and at least one point mutation) in atleast one assay described herein (e.g., biochemical or cellular). Insome embodiments, the term “selectively inhibits,” as used in comparisonto WT EGFR inhibition means that Compound 2 is at least 50 times morepotent, at least 45 times, at least 40, at least 35, at least 30, atleast 25, or at least 20 times more potent as an inhibitor of at leastone mutation of EGFR, as defined and described herein, as compared to WTEGFR.

As used herein, the term “sparing as to WT EGFR” means that a selectiveinhibitor of at least one mutation of EGFR, as defined and describedabove and herein, inhibits EGFR at the upper limit of detection of atleast one assay, such as those described in the '061 application (e.g.,biochemical or cellular as described in detail in Examples 56-58). Invitro assays include assays that determine inhibition of thephosphorylation activity and/or the subsequent functional consequences,or ATPase activity of activated EGFR (WT or mutant). Alternate in vitroassays quantitate the ability of the inhibitor to bind to EGFR (WT ormutant). Inhibitor binding may be measured by radiolabeling theinhibitor prior to binding, isolating the inhibitor/EGFR (WT or mutant)complex and determining the amount of radiolabel bound. Alternatively,inhibitor binding may be determined by running a competition experimentwhere new inhibitors are incubated with EGFR (WT or mutant) bound toknown radioligands. In some embodiments, the term “sparing as to WTEGFR” means that Compound 2 inhibits WT EGFR with an IC₅₀ of at least 10μM, at least 9 μM, at least 8 μM, at least 7 μM, at least 6 μM, at least5 μM, at least 3 μM, at least 2 μM, or at least 1 μM.

In certain embodiments, Compound 2 selectively inhibits (a) at least oneactivating mutation; and (b) T790M; and (c) is sparing as to WT. In someembodiments, an at least one activating mutation is a deletion mutation.In some embodiments, an at least one activating mutation is a pointmutation. In some embodiments, an activating mutation is delE746-A750.In some embodiments, an activating mutation is L858R. In someembodiments, an activating mutation is G719S.

In some embodiments, the at least one mutation of EGFR is L858R and/orT790M.

Without wishing to be bound by any particular theory, it is believedthat administration of Compound 2 to a patient having at least oneactivating mutation may preempt formation of the T790M resistancemutation. Thus, in certain embodiments, the present invention provides amethod for inhibiting an activating mutation in a patient comprisingadministering to the patient Compound 2 or composition thereof, asdescribed herein.

One of ordinary skill in the art will appreciate that certain patientshave an oncogenic form of the T790M mutation, i.e., the T790M mutationis present prior to administrating any EGFR kinase inhibitor to apatient and is therefore oncogenic. Accordingly, in some embodiments,the present invention provides a method for inhibiting oncogenic T790Min a patient comprising administering to the patient a provided compoundor composition thereof, as described herein.

In certain embodiments, the amount of Compound 2 in a composition iseffective to measurably inhibit at least one mutant of EGFR selectivelyas compared to WT EGFR and other protein kinases (e.g., ErbB2, ErbB4, aTEC-kinase, and/or JAK3), in a biological sample or in a patient.

As used herein, the terms “treatment,” “treat,” and “treating” refer toreversing, alleviating, delaying the onset of, or inhibiting theprogress of a disease or disorder, or one or more symptoms thereof, asdescribed herein. In some embodiments, treatment may be administeredafter one or more symptoms have developed. In other embodiments,treatment may be administered in the absence of symptoms. For example,treatment may be administered to a susceptible individual prior to theonset of symptoms (e.g., in light of a history of symptoms and/or inlight of genetic or other susceptibility factors). Treatment may also becontinued after symptoms have resolved, for example to prevent or delaytheir recurrence.

Compound 2 is an inhibitor of at least one mutant of EGFR and istherefore useful for treating one or more disorders associated withactivity of one of more EGFR mutants (e.g., a deletion mutation, anactivating mutation, a resistant mutation, or combination thereof).Thus, in certain embodiments, the present invention provides a methodfor treating a mutant EGFR-mediated disorder comprising the step ofadministering to a patient in need thereof Compound 2 orpharmaceutically acceptable composition thereof.

As used herein, the term “mutant EGFR-mediated” disorders or conditionsas used herein means any disease or other deleterious condition in whichat least one mutant of EGFR is known to play a role. In certainembodiments, an at least one mutant of EGFR is T790M. In someembodiments, the at least one mutant of EGFR is a deletion mutation. Incertain embodiments, the at least one mutant of EGFR is an activatingmutation. In some embodiments, the at least one mutant of EGFR is L858Rand/or T790M. In certain embodiments, a provided compound selectivelyinhibits (a) at least one activating mutation, (b) T790M, and (c) issparing as to WT. In some embodiments, an at least one activatingmutation is a deletion mutation. In some embodiments, an at least oneactivating mutation is a point mutation. In some embodiments, anactivating mutation is delE746-A750. In some embodiments, an activatingmutation is L858R. In some embodiments, an activating mutation is G719S.

Accordingly, another embodiment of the present invention relates totreating or lessening the severity of one or more diseases in which atleast one mutant of EGFR is known to play a role. Specifically, thepresent invention relates to a method of treating or lessening theseverity of a disease or condition selected from a proliferativedisorder, wherein said method comprises administering to a patient inneed thereof a compound or composition according to the presentinvention.

In some embodiments, the present invention provides a method fortreating or lessening the severity of one or more disorders selectedfrom a cancer. In some embodiments, the cancer is associated with asolid tumor. In certain embodiments, the cancer is breast cancer,glioblastoma, lung cancer, cancer of the head and neck, colorectalcancer, bladder cancer, or non-small cell lung cancer. In someembodiments, the present invention provides a method for treating orlessening the severity of one or more disorders selected from squamouscell carcinoma, salivary gland carcinoma, ovarian carcinoma, orpancreatic cancer.

In certain embodiments, the present invention provides a method fortreating or lessening the severity of neurofibromatosis type I (NF1),neurofibromatosis type II (NF2) Schwann cell neoplasms (e.g. MPNST's),or Schwannomas.

Compound 2 and compositions thereof, according to the method of thepresent invention, may be administered using any amount and any route ofadministration effective for treating or lessening the severity of acancer. The exact amount required will vary from subject to subject,depending on the species, age, and general condition of the subject, theseverity of the infection, the particular agent, its mode ofadministration, and the like. Compound 2 is preferably formulated indosage unit form for ease of administration and uniformity of dosage.The expression “dosage unit form” as used herein refers to a physicallydiscrete unit of agent appropriate for the patient to be treated. Itwill be understood, however, that the total daily usage of the compoundsand compositions of the present invention will be decided by theattending physician within the scope of sound medical judgment. Thespecific effective dose level for any particular patient or organismwill depend upon a variety of factors including the disorder beingtreated and the severity of the disorder; the activity of the specificcompound employed; the specific composition employed; the age, bodyweight, general health, sex and diet of the patient; the time ofadministration, route of administration, and rate of excretion of thespecific compound employed; the duration of the treatment; drugs used incombination or coincidental with the specific compound employed, andlike factors well known in the medical arts. The term “patient”, as usedherein, means an animal, preferably a mammal, and most preferably ahuman.

Pharmaceutically acceptable compositions of this invention can beadministered to humans and other animals orally, rectally, parenterally,intracisternally, intravaginally, intraperitoneally, topically (as bypowders, ointments, or drops), bucally, as an oral or nasal spray, orthe like, depending on the severity of the infection being treated. Incertain embodiments, Compound 2 may be administered orally orparenterally at dosage levels of about 0.01 mg/kg to about 60 mg/kg, orabout 0.1 mg/kg to about 50 mg/kg, or about 0.25 mg/kg to about 45 mg/kgand preferably from about 0.5 mg/kg to about 25 mg/kg, of subject bodyweight per day, one or more times a day, to obtain the desiredtherapeutic effect.

Liquid dosage forms for oral administration include, but are not limitedto, pharmaceutically acceptable emulsions, microemulsions, solutions,suspensions, syrups and elixirs. In addition to Compound 2, the liquiddosage forms may contain inert diluents commonly used in the art suchas, for example, water or other solvents, solubilizing agents andemulsifiers such as ethyl alcohol, isopropyl alcohol, ethyl carbonate,ethyl acetate, benzyl alcohol, benzyl benzoate, polyethylene glycol(e.g., PEG 200, PEG 400, PEG 1000, PEG 2000), propylene glycol,1,3-butylene glycol, dimethylformamide, oils (in particular, cottonseed,groundnut, corn, germ, olive, castor, and sesame oils), glycerol,tetrahydrofurfuryl alcohol, Vitamin E polyethylene glycol succinate(d-alpha tocopheryl polyethylene glycol 1000 succinate), polyethyleneglycols and fatty acid esters of sorbitan, and mixtures thereof. Besidesinert diluents, the oral compositions can also include adjuvants such aswetting agents, emulsifying and suspending agents, sweetening,flavoring, and perfuming agents. The liquid forms above can also befilled into a soft or hard capsule to form a solid dosage form. Suitablecapsules can be formed from, for example, gelatin, strach and cellulosederivatives (e.g., hydroxycellulose, hydropropylmethylcellulose).

Injectable preparations, for example, sterile injectable aqueous oroleaginous suspensions may be formulated according to the known artusing suitable dispersing or wetting agents and suspending agents. Thesterile injectable preparation may also be a sterile injectablesolution, suspension or emulsion in a nontoxic parenterally acceptablediluent or solvent, for example, as a solution in 1,3-butanediol. Amongthe acceptable vehicles and solvents that may be employed are water,Ringer's solution, U.S.P. and isotonic sodium chloride solution. Inaddition, sterile, fixed oils are conventionally employed as a solventor suspending medium. For this purpose any bland fixed oil can beemployed including synthetic mono- or diglycerides. In addition, fattyacids such as oleic acid are used in the preparation of injectables.

Injectable formulations can be sterilized, for example, by filtrationthrough a bacterial-retaining filter, or by incorporating sterilizingagents in the form of sterile solid compositions which can be dissolvedor dispersed in sterile water or other sterile injectable medium priorto use.

In order to prolong the effect of Compound 2 of the present invention,it is often desirable to slow the absorption of the compound fromsubcutaneous or intramuscular injection. This may be accomplished by theuse of a liquid suspension of crystalline or amorphous material withpoor water solubility. The rate of absorption of the compound thendepends upon its rate of dissolution that, in turn, may depend uponcrystal size and crystalline form. Alternatively, delayed absorption ofa parenterally administered compound form is accomplished by dissolvingor suspending the compound in an oil vehicle. Injectable depot forms aremade by forming microencapsule matrices of the compound in biodegradablepolymers such as polylactide-polyglycolide. Depending upon the ratio ofcompound to polymer and the nature of the particular polymer employed,the rate of compound release can be controlled. Examples of otherbiodegradable polymers include poly(orthoesters) and poly(anhydrides).Depot injectable formulations are also prepared by entrapping thecompound in liposomes or microemulsions that are compatible with bodytissues.

Compositions for rectal or vaginal administration are preferablysuppositories which can be prepared by mixing Compound 2 of thisinvention with suitable non-irritating excipients or carriers such ascocoa butter, polyethylene glycol or a suppository wax which are solidat ambient temperature but liquid at body temperature and therefore meltin the rectum or vaginal cavity and release the active compound.

Solid dosage forms for oral administration include capsules, tablets,pills, powders, and granules. In such solid dosage forms, Compound 2 ismixed with at least one inert, pharmaceutically acceptable excipient orcarrier such as sodium citrate, Avicel, hydroxypropyl cellulose ordicalcium phosphate and/or a) fillers or extenders such as starches,lactose, sucrose, glucose, mannitol, and silicic acid, b) binders suchas, for example, carboxymethylcellulose, alginates, gelatin,polyvinylpyrrolidinone, sucrose, PVP vinyl acetate, and acacia, c)humectants such as glycerol, d) disintegrating agents such as agar-agar,calcium carbonate, potato or tapioca starch, alginic acid, certainsilicates, sodium croscarmellose and sodium carbonate, e) solutionretarding agents such as paraffin, f) absorption accelerators such asquaternary ammonium compounds, g) wetting agents such as, for example,cetyl alcohol and glycerol monostearate, h) absorbents such as kaolinand bentonite clay, i) lubricants such as talc, calcium stearate,magnesium stearate, solid polyethylene glycols, sodium lauryl sulfate,j) solubilising agents such as Vitamin E polyethylene glycol succinate(d-alpha tocopheryl polyethylene glycol 1000 succinate), steric acid,and mixtures thereof. In the case of capsules, tablets and pills, thedosage form may also comprise buffering agents.

Solid compositions of a similar type may also be employed as fillers insoft and hard-filled capsules using such excipients as lactose or milksugar as well as high molecular weight polyethylene glycols and thelike. The solid dosage forms of tablets, dragees, capsules, pills, andgranules can be prepared with coatings and shells such as entericcoatings and other coatings well known in the pharmaceutical formulatingart. They may optionally contain opacifying agents and can also be of acomposition that they release the active ingredient(s) only, orpreferentially, in a certain part of the intestinal tract, optionally,in a delayed manner. Examples of embedding compositions that can be usedinclude polymeric substances and waxes. Solid compositions of a similartype may also be employed as fillers in soft and hard-filled capsulesusing such excipients as lactose or milk sugar as well as high molecularweight polyethylene glycols and the like.

Compound 2 can also be in micro-encapsulated form with one or moreexcipients as noted above. The solid dosage forms of tablets, dragees,capsules, pills, and granules can be prepared with coatings and shellssuch as cosmetic coatings, enteric coatings, release controllingcoatings and other coatings well known in the pharmaceutical formulatingart. In such solid dosage forms the active compound may be admixed withat least one inert diluent such as a polymer, sucrose, lactose orstarch. Such dosage forms may also comprise, as is normal practice,additional substances other than inert diluents, e.g., tabletinglubricants and other tableting aids such a magnesium stearate andmicrocrystalline cellulose. In the case of capsules, tablets and pills,the dosage forms may also comprise buffering agents. They may optionallycontain opacifying agents and can also be of a composition that theyrelease the active ingredient(s) only, or preferentially, in a certainpart of the intestinal tract, optionally, in a delayed manner. Examplesof embedding compositions that can be used include polymeric substancesand waxes.

Dosage forms for topical or transdermal administration of Compound 2include ointments, pastes, creams, lotions, gels, powders, solutions,sprays, inhalants or patches. The active component is admixed understerile conditions with a pharmaceutically acceptable carrier and anyneeded preservatives or buffers as may be required. Ophthalmicformulation, ear drops, and eye drops are also contemplated as beingwithin the scope of this invention. Additionally, the present inventioncontemplates the use of transdermal patches, which have the addedadvantage of providing controlled delivery of a compound to the body.Such dosage forms can be made by dissolving or dispensing the compoundin the proper medium. Absorption enhancers can also be used to increasethe flux of the compound across the skin. The rate can be controlled byeither providing a rate controlling membrane or by dispersing thecompound in a polymer matrix or gel.

According to one embodiment, the invention relates to a method ofinhibiting protein kinase activity in a biological sample comprising thestep of contacting said biological sample with Compound 2 or acomposition comprising said compound.

According to another embodiment, the invention relates to a method ofinhibiting at least one mutant of EGFR (e.g., a deletion mutation, anactivating mutation, a resistant mutations, or combination thereof)activity in a biological sample comprising the step of contacting saidbiological sample with Compound 2, or a composition comprising thecompound. In certain embodiments, the invention relates to a method ofirreversibly inhibiting at least one mutant of EGFR (e.g., a deletionmutation, an activating mutation, a resistant mutation, or combinationthereof) activity in a biological sample comprising the step ofcontacting the biological sample with Compound 2, or a compositioncomprising the compound.

In certain embodiments, Compound 2 selectively inhibits in a biologicalsample (a) at least one activating mutation, (b) T790M, and (c) issparing as to WT. In some embodiments, an at least one activatingmutation is a deletion mutation. In some embodiments, an at least oneactivating mutation is a point mutation. In some embodiments, anactivating mutation is delE746-A750. In some embodiments, an activatingmutation is L858R. In some embodiments, an activating mutation is G719S.

The term “biological sample”, as used herein, includes, withoutlimitation, cell cultures or extracts thereof; biopsied materialobtained from a mammal or extracts thereof; and blood, saliva, urine,feces, semen, tears, or other body fluids or extracts thereof.

Inhibition of at least one mutant of EGFR (e.g., a deletion mutation, anactivating mutation, a resistant mutation, or combination thereof)activity in a biological sample is useful for a variety of purposes thatare known to one of skill in the art. Examples of such purposes include,but are not limited to, blood transfusion, organ transplantation,biological specimen storage, and biological assays.

Another embodiment of the present invention relates to a method ofinhibiting at least one mutant of EGFR (e.g., a deletion mutation, anactivating mutation, a resistant mutation, or combination thereof)activity in a patient comprising the step of administering to thepatient Compound 2 or a composition comprising the compound. In certainembodiments, the present invention provides a method for inhibiting (a)at least one activating mutation, and (b) T790M in a patient, and (c) issparing as to WT, wherein the method comprises administering to thepatient Compound 2 or composition thereof. In some embodiments, an atleast one activating mutation is a deletion mutation. In someembodiments, an at least one activating mutation is a point mutation. Insome embodiments, the present invention provides a method for inhibitingat least one mutant of EGFR in a patient, wherein an activating mutationis delE746-A750. In some embodiments, the present invention provides amethod for inhibiting at least one mutant of EGFR in a patient, whereinan activating mutation is L858R. In some embodiments, the presentinvention provides a method for inhibiting at least one mutant of EGFRin a patient, wherein an activating mutation is G719S.

According to another embodiment, the invention relates to a method ofinhibiting at least one mutant of EGFR (e.g., a deletion mutation, anactivating mutation, a resistant mutation, or combination thereof)activity in a patient comprising the step of administering to thepatient Compound 2 or a composition comprising the compound. Accordingto certain embodiments, the invention relates to a method ofirreversibly inhibiting at least one mutant of EGFR activity (e.g., adeletion mutation, an activating mutation, a resistant mutation, orcombination thereof) in a patient comprising the step of administeringto said patient Compound 2 or a composition comprising the compound. Incertain embodiments, the present invention provides a method forirreversibly inhibiting (a) at least one activating mutation, and (b)T790M in a patient, and (c) is sparing as to WT, wherein said methodcomprises administering to the patient Compound 2 or compositionthereof. In some embodiments, an irreversibly inhibited at least oneactivating mutation is a deletion mutation. In some embodiments, anirreversibly inhibited at least one activating mutation is a pointmutation. In some embodiments, the present invention provides a methodfor irreversibly inhibiting at least one mutant of EGFR in a patient,wherein an activating mutation is delE746-A750. In some embodiments, thepresent invention provides a method for irreversibly inhibiting at leastone mutant of EGFR in a patient, wherein an activating mutation isL858R. In some embodiments, the present invention provides a method forirreversibly inhibiting at least one mutant of EGFR in a patient,wherein an activating mutation is G719S.

In other embodiments, the present invention provides a method fortreating a disorder mediated by one or more of at least one mutant ofEGFR (e.g., a deletion mutation, an activating mutation, a resistantmutation, or combination thereof) in a patient in need thereof,comprising the step of administering to said patient Compound 2 orpharmaceutically acceptable composition thereof. Such disorders aredescribed in detail herein.

Depending upon the particular condition, or disease, to be treated,additional therapeutic agents, which are normally administered to treatthat condition, may also be present in the compositions of thisinvention or as part of a treatment regimen including Compound 2. Asused herein, additional therapeutic agents that are normallyadministered to treat a particular disease, or condition, are known as“appropriate for the disease or condition being treated.”

For example, Compound 2 or a pharmaceutically acceptable compositionthereof is administered in combination with chemotherapeutic agents totreat proliferative diseases and cancer. Examples of knownchemotherapeutic agents include, but are not limited to, Adriamycin,dexamethasone, vincristine, cyclophosphamide, fluorouracil, topotecan,taxol, interferons, platinum derivatives, taxane (e.g., paclitaxel),vinca alkaloids (e.g., vinblastine), anthracyclines (e.g., doxorubicin),epipodophyllotoxins (e.g., etoposide), cisplatin, an mTOR inhibitor(e.g., a rapamycin), methotrexate, actinomycin D, dolastatin 10,colchicine, emetine, trimetrexate, metoprine, cyclosporine,daunorubicin, teniposide, amphotericin, alkylating agents (e.g.,chlorambucil), 5-fluorouracil, campthothecin, cisplatin, metronidazole,and Gleevec™, among others. In other embodiments, Compound 2 isadministered in combination with a biologic agent, such as Avastin orVECTIBIX.

In certain embodiments, Compound 2 or a pharmaceutically acceptablecomposition thereof is administered in combination with anantiproliferative or chemotherapeutic agent selected from any one ormore of abarelix, aldesleukin, alemtuzumab, alitretinoin, allopurinol,altretamine, amifostine, anastrozole, arsenic trioxide, asparaginase,azacitidine, BCG Live, bevacuzimab, fluorouracil, bexarotene, bleomycin,bortezomib, busulfan, calusterone, capecitabine, camptothecin,carboplatin, carmustine, celecoxib, cetuximab, chlorambucil, cladribine,clofarabine, cyclophosphamide, cytarabine, dactinomycin, darbepoetinalfa, daunorubicin, denileukin, dexrazoxane, docetaxel, doxorubicin(neutral), doxorubicin hydrochloride, dromostanolone propionate,epirubicin, epoetin alfa, erlotinib, estramustine, etoposide phosphate,etoposide, exemestane, filgrastim, floxuridine fludarabine, fulvestrant,gefitinib, gemcitabine, gemtuzumab, goserelin acetate, histrelinacetate, hydroxyurea, ibritumomab, idarubicin, ifosfamide, imatinibmesylate, interferon alfa-2a, interferon alfa-2b, irinotecan,lenalidomide, letrozole, leucovorin, leuprolide acetate, levamisole,lomustine, megestrol acetate, melphalan, mercaptopurine, 6-MP, mesna,methotrexate, methoxsalen, mitomycin C, mitotane, mitoxantrone,nandrolone, nelarabine, nofetumomab, oprelvekin, oxaliplatin,paclitaxel, palifermin, pamidronate, pegademase, pegaspargase,pegfilgrastim, pemetrexed disodium, pentostatin, pipobroman, plicamycin,porfimer sodium, procarbazine, quinacrine, rasburicase, rituximab,sargramostim, sorafenib, streptozocin, sunitinib maleate, talc,tamoxifen, temozolomide, teniposide, VM-26, testolactone, thioguanine,6-TG, thiotepa, topotecan, toremifene, tositumomab, trastuzumab,tretinoin, ATRA, uracil mustard, valrubicin, vinblastine, vincristine,vinorelbine, zoledronate, or zoledronic acid.

Other examples of agents the inhibitors of this invention may also becombined with include, without limitation: treatments for Alzheimer'sDisease such as donepezil hydrochloride (Aricept®) and rivastigmine(Exelon®); treatments for Parkinson's Disease such as L-DOPA/carbidopa,entacapone, ropinrole, pramipexole, bromocriptine, pergolide,trihexephendyl, and amantadine; agents for treating Multiple Sclerosis(MS) such as beta interferon (e.g., Avonex® and Rebif®), glatirameracetate (Copaxone®), and mitoxantrone; treatments for asthma such asalbuterol and montelukast (Singulair®); agents for treatingschizophrenia such as zyprexa, risperdal, seroquel, and haloperidol;anti-inflammatory agents such as corticosteroids, TNF blockers, IL-1 RA,azathioprine, cyclophosphamide, and sulfasalazine; immunomodulatory andimmunosuppressive agents such as cyclosporin, tacrolimus, rapamycin,mycophenolate mofetil, interferons, corticosteroids, cyclophophamide,azathioprine, and sulfasalazine; neurotrophic factors such asacetylcholinesterase inhibitors, MAO inhibitors, interferons,anti-convulsants, ion channel blockers, riluzole, and anti-Parkinsonianagents; agents for treating cardiovascular disease such asbeta-blockers, ACE inhibitors, diuretics, nitrates, calcium channelblockers, and statins; agents for treating liver disease such ascorticosteroids, cholestyramine, interferons, and anti-viral agents;agents for treating blood disorders such as corticosteroids,anti-leukemic agents, and growth factors; and agents for treatingimmunodeficiency disorders such as gamma globulin.

In certain embodiments, Compound 2 or a pharmaceutically acceptablecomposition thereof is administered in combination with a monoclonalantibody or an siRNA therapeutic.

The additional agents may be administered separately from a Compound2-containing composition, as part of a multiple dosage regimen.Alternatively, those agents may be part of a single dosage form, mixedtogether with Compound 2 in a single composition. If administered aspart of a multiple dosage regime, the two active agents may be submittedsimultaneously, sequentially or within a period of time from one another(e.g., one hour, two hours, six hours, twelve hours, one day, one week,two weeks, one month).

As used herein, the terms “combination,” “combined,” and related termsrefer to the simultaneous or sequential administration of therapeuticagents in accordance with this invention. For example, Compound 2 may beadministered with another therapeutic agent simultaneously orsequentially in separate unit dosage forms or together in a single unitdosage form. Accordingly, the present invention provides a single unitdosage form comprising Compound 2, an additional therapeutic agent, anda pharmaceutically acceptable carrier, adjuvant, or vehicle.

The amount of Compound 2 and additional therapeutic agent (in thosecompositions which comprise an additional therapeutic agent as describedabove) that may be combined with the carrier materials to produce asingle dosage form will vary depending upon the host treated and theparticular mode of administration. Preferably, compositions of thisinvention should be formulated so that a dosage of between 0.01-100mg/kg body weight/day of Compound 2 can be administered.

In those compositions that include an additional therapeutic agent, thatadditional therapeutic agent and Compound 2 may act synergistically.Therefore, the amount of additional therapeutic agent in suchcompositions may be less than that required in a monotherapy utilizingonly that therapeutic agent. In such compositions, a dosage of between0.01-1,000 μg/kg body weight/day of the additional therapeutic agent canbe administered.

The amount of additional therapeutic agent present in the compositionsof this invention will be no more than the amount that would normally beadministered in a composition comprising that therapeutic agent as theonly active agent. Preferably the amount of additional therapeutic agentin the presently disclosed compositions will range from about 50% to100% of the amount normally present in a composition comprising thatagent as the only therapeutically active agent.

Compound 2 or pharmaceutical compositions thereof may also beincorporated into compositions for coating an implantable medicaldevice, such as prostheses, artificial valves, vascular grafts, stentsand catheters. Vascular stents, for example, have been used to overcomerestenosis (re-narrowing of the vessel wall after injury). However,patients using stents or other implantable devices risk clot formationor platelet activation. These unwanted effects may be prevented ormitigated by pre-coating the device with a pharmaceutically acceptablecomposition comprising a kinase inhibitor. Implantable devices coatedwith Compound 2 are another embodiment of the present invention.

All features of each of the aspects of the invention apply to all otheraspects mutatis mutandis.

In order that the invention described herein may be more fullyunderstood, the following examples are set forth. It should beunderstood that these examples are for illustrative purposes only andare not to be construed as limiting this invention in any manner.

EXEMPLIFICATION

As depicted in the Examples below, in certain exemplary embodiments,compounds are prepared according to the following general procedures. Itwill be appreciated that, although the general methods depict thesynthesis of certain compounds of the present invention, the followinggeneral methods, and other methods known to one of ordinary skill in theart, can be applied to all compounds and subclasses and species of eachof these compounds, as described herein.

Preparation of Compound 1

The synthesis of Compound 1 is described in detail at Example 3 of the'061 application.

Step 1:

In a 25 mL 3-neck round-bottom flask previously equipped with a magneticstirrer, Thermo pocket and CaCl₂ guard tube, N-Boc-1,3-diaminobenzene(0.96 g) and n-butanol (9.00 mL) were charged. The reaction mixture wascooled to 0° C. 2,4-Dichloro-5-trifluoromethylpyrimidine (1.0 g) wasadded dropwise to the above reaction mixture at 0° C.Diisopropylethylamine (DIPEA) (0.96 mL) was dropwise added to the abovereaction mixture at 0° C. and the reaction mixture was stirred for 1 hrat 0° C. to 5° C. Finally, the reaction mixture was allowed to warm toroom temperature. The reaction mixture was stirred for another 4 hrs atroom temperature. Completion of reaction was monitored by TLC usinghexane:ethyl acetate (7:3). The solid precipitated out was filtered offand washed with 1-butanol (2 mL). The solid was dried under reducedpressure at 40° C. for 1 hr. ¹H-NMR (DMSO-d6, 400 MHz) δ 1.48 (S, 9H),7.02 (m, 1H), 7.26 (m, 2H), 7.58 (S, 1H), 8.57 (S, 1H), 9.48 (S, 1H),9.55 (S, 1H).

Step 2:

To the above crude (3.1 g) in dichloromethane (DCM) (25 mL) was addedtrifluoroacetic acid (TFA) (12.4 mL) slowly at 0° C. The reactionmixture was allowed to warm to room temperature. The reaction mixturewas stirred for another 10 min at room temperature. The crude wasconcentrated under reduced pressure.

Step 3:

The concentrated crude was dissolved in DIPEA (2.0 mL) anddichloromethane (25 mL), and then cooled to −30° C. To the reactionmixture was slowly added acryloyl chloride (0.76 g) at −30° C. Thereaction mass was warmed to room temperature stirred at room temperaturefor 1.0 hr. The reaction was monitored on TLC using hexane:ethyl acetate(7:3) as mobile phase. The reaction was completed after 1 hr. Step 3yielded intermediate 1.

Step 4:

To obtain a salt of compound 1, a mixture of intermediate 1 (16 mg) and2-methoxy-4-(4-acetylpiperazinyl)aniline in dioxane (1.0 mL) withcatalytic trifluoroacetic acid was stirred overnight at 50° C. The crudewas concentrated under reduced pressure and purified using HPLC (TFAmodifier) to give compound 1 as a TFA salt. ¹H-NMR (DMSO-d6, 400 MHz) δ10.2 (S, 1H), 8.2 (br, 1H), 8.30 (S, 1H), 7.73 (br, 1H), 7.52 (d, J=7.8Hz, 1H), 7.45 (d, J=7.8 Hz, 1H), 7.26 (J=8.2 Hz, 1H), 7.14 (be, 1H),6.60 (S, 1H), 6.42 (dd, J=11.4, 16.9 Hz, 1H), 6.24 (d, J=16.9 Hz, 1H),5.75 (d, J=11.4 Hz, 1H), 3.76 (S, 3H), 3.04 (br, 4H), 2.04 (S, 3H);calculated mass for C₂₇H₂₈F₃N₇O₃: 555.2, found: 556.2 (M+H⁺).

Step 5:

To obtain the free base form of Compound 1 from the TFA salt, the saltwas added to DCM and cooled to 0° C. Na₂CO₃ solution (9.6% w/w) wasadded at 0° C. The mixture was warmed to 20° C. and stirred for 35 min.The pH of the aqueous layer was >8. The layers were separated.Extraction of the aqueous layer was performed using DCM. The organiclayers were combined and washed with brine. The organic layer wascollected and evaporated to yield a solid of Compound 1.

General Preparation of Compound 2

For each counterion and solvent system, ca. 25 or 50 mg of the free baseof Compound 1 was slurried in 200-300 μl of the allocated solvent. Thesolvents included acetone, dichloromethane, cyclohexane, ethyl acetate,methanol (methyl ethyl ketone for sulfonic acid-containing counterions),methyl isobutyl ketone, 2-propanol (isopropyl acetate for sulfonicacid-containing counterions), tetrahydrofuran and acetonitrile:water(90:10). The respective counterion was also dissolved/slurried in200-300 μl of the allocated solvent. The counterions includedbenzenesulfonic acid, camphor sulfonic acid, 1,2-ethane disulfonic acid,hydrobromic acid, hydrochloric acid, maleic acid, methanesulfonic acid,naphthalene-2-sulfonic acid, 1,5-naphthalene disulfonic acid, oxalicacid, 4-toluenesulfonic acid and 2,4,6-trihydroxybenzoic acid. Oneequivalent of each counterion was used and additional experiments withtwo equivalents of benzenesulfonic acid, hydrochloric acid, sulphuricacid and p-toluenesulfonic acid were performed. The acid solution/slurrywas then added to the slurry of Compound 1 in small aliquots in order tominimize the risk of degradation. The pH of the reaction was thenchecked using universal indicator paper.

The mixtures of Compound 1/counterion/solvent created using theprocedure above were temperature cycled between ca. 0° C. and ambient(ca. 22° C.) whilst stirring in 1 hour cycles for a period of 1-2 days.Overnight, samples were kept at ca. 2-5° C. The mixtures were visuallychecked for any obvious signs of degradation (i.e. color changes) andthen, if not visually degraded, any solids present were isolated andallowed to dry at ambient conditions prior to analysis. The solidsrepresent isolated Compound 2.

General Procedures

The solubility of the potential salts was tested using a shake flaskmethod whereby a slurry of each salt was prepared in deionized water andthe pH of the reaction was reduced to below pH 2 by adding a smallamount of the counterion used for salt formation. The pH was testedusing universal indicator paper. After ca. 24 hours of shaking, theslurries were filtered for the solubility determination using HPLCanalysis.

X-Ray Powder Diffraction. X-ray powder diffraction (XRPD) analysis wascarried out on a Siemens D5000, scanning the samples between 3 and 30,35 or 50°2θ. For samples <100 mg, ca. 5-10 mg of sample was gentlycompressed onto a glass slide which fitted into the sample holder. Forsamples >100 mg, ca. 100 mg of sample was gently compressed into aplastic sample holder, so that the sample surface was smooth and justabove the level of the sample holder. Measurements were made using thefollowing experimental conditions:

start position 3.00 °2θ end position 30, 35 or 50 °2θ step size 0.02 °2θscan step time 1 s scan type continuous offset 0 °2θ divergence slittype fixed divergence slit size 2.0000° receiving slit size 0.2 mmtemperature 20° C. anode material copper (Cu) K-Alpha1 1.54060 AngstromsK-Alpha2 1.54443 Angstroms K-Beta 1.39225 Angstroms K-A2/K-A1 Ratio0.50000 Generator settings 40 mA, 40 kV goniometer radius 217.50

Polarized Light Microscopy. In polarized light microscopy (PLM), thepresence of crystallinity (birefringence) was determined using anOlympus BX50 polarising microscope, equipped with a Motic camera andimage capture software (Motic Images Plus 2.0). All images were recordedusing the 20× objective, unless otherwise stated.

Thermogravimetric Analysis. For thermogravimetric analysis (TGA),approximately 5-10 mg of material was accurately weighed into an openaluminium pan and loaded into a simultaneousthermogravimetric/differential thermal analyser (TG/DTA) and held atroom temperature. The sample was then heated at a rate of 10° C./minfrom 25° C. to 300° C. during which time the change in sample weight wasrecorded along with any differential thermal events (DTA). Nitrogen wasused as the purge gas, at a flow rate of 100 cm³/min.

Differential Scanning calorimetry. For differential scanning calorimetry(DSC), approximately 5-10 mg of material was weighed into an aluminiumDSC pan and sealed non-hermetically with a pierced aluminium lid. Thesample pan was then loaded into a Seiko DSC6200 (equipped with a cooler)cooled and held at 25° C. Once a stable heat-flow response was obtained,the sample and reference were heated to ca. 260° C.-280° C. at scan rateof 10° C./min and the resulting heat flow response monitored.

Nuclear Magnetic Resonance Spectroscopy. ¹H-NMR experiments wereperformed on a Bruker AV400 (¹H frequency: 400 MHz). ¹H experiments ofeach sample were performed in deuterated DMSO and each sample wasprepared to ca. 1 mg/mL concentration.

Dynamic Vapour Sorption. For dynamic vapour sorption (DVS),approximately 10-20 mg of sample was placed into a wire mesh vapoursorption balance pan and loaded into a DVS-1 dynamic vapour sorptionbalance by Surface Measurement Systems. The sample was subjected to aramping profile from 20-90% relative humidity (RH) at 10% increments,maintaining the sample at each step until a stable weight had beenachieved (99.5% step completion). After completion of the sorptioncycle, the sample was dried using the same procedure, but all the waydown to 0% RH and finally taken back to the starting point of 20% RH.The weight change during the sorption/desorption cycles were plotted,allowing for the hygroscopic nature of the sample to be determined

Infrared Spectroscopy Infrared spectroscopy (IR) was carried out on aBruker ALPHA P spectrometer. Sufficient material was placed onto thecentre of the plate of the spectrometer and the spectra were obtainedusing the following parameters:

resolution 4 cm⁻¹ background scan time 16 scans sample scan time 16scans data collection 4000 to 400 cm⁻¹ result spectrum transmittancesoftware OPUS version 6

For Karl Fischer (KF) Coulometric titration, 10-15 mg of solid materialwas accurately weighed into a vial. The solid was then manuallyintroduced into the titration cell of a Mettler Toledo C30 CompactTitrator. The vial was back-weighed after the addition of the solid andthe weight of the added solid entered on the instrument. Titration wasinitiated once the sample had fully dissolved in the cell. The watercontent was calculated automatically by the instrument as a percentageand the data printed.

Reverse-phase gradient high performance liquid chromatography (HPLC) wasperformed on an Agilent 1100 instrument fitted with a C18, 3.0×100mm×3.5 μm column. The detection wavelength was 240 nm.

A Sotax AT7 dissolution bath (USP 2, EP 2 apparatus) was used for thedissolution study in which paddles were used to stir the media. Alltests were carried out at 37° C. and a paddle speed of 100 rpm.

Example 1 Primary Salt Screen

The results of the primary salt screen, based on the general preparationof Compound 2, are shown in Table 1. Table 1 indicates the counterion,the solvent and the solid form(s) obtained.

TABLE 1 Results of Primary Salt Screen Solvent 2-Propanol Equiv- Methyl-(IPA) or alents Dichloro- Cyclo- Ethyl Methanol isobutyl IsopropylTetrahydro- Acetonitrile:Water Counterion of Acid Acetone methane hexaneAcetate or MEK Ketone acetate furan (10%) 2,4,6-Trihydroxybenzoic 1 FCFC FA FC FA AM S1 FC FC S2 S2 Benzenesulfonic acid 1 S1 XR FC FC S1 S2S2 S2 S1 FC XR Benzenesulfonic acid 2 S1 AM FC S1 S1 FC FC S1 S2Hydrochloric acid 1 AM FC FC FC FC AM FC FC S1 Hydrochloric acid 2 AM S1FC XR S1 XR S1 S2 S XR AM S1 Maleic acid 1 XR S1 FC FA XR XR S2 FC FC S3S2 XR Methanesulfonic acid 2 S1 AM FC AM S1 AM AM S1 AM Oxalic acid 1 S1AM FC FA S1 S1 AM AM AM S2 Sulfuric acid 1 GM FC FC FC AM FC AM FC SP AMSulfuric acid 2 FC FC FC FC FC FC FC FC FC p-Toluenesulfonic acid 1 S1S1 FC S1 S1 S1 FC S2 AM monohydrate p-Toluenesulfonic acid 2 S1 S1 FC S1S2 AM AM S2 XR AM monohydrate 1,2-Ethane disulfonic acid 1 AM AM FC FCS1 FC FC AM S2 dehydrate 1,2-Ethane disulfonic acid 2 AM AM FC AM S1 FCFC AM S2 dehydrate Hydrobromic acid 1 AM S1 FC/S1 S1 S1(?) S1 S1 S1 S1Hydrobromic acid 2 S1/XR S1 S1 S1 S1 S1 S1 S2 S1 Naphthalene-2-sulfonicacid 1 S1 S1 FC S1 S1 S1 S1 AM S1 Naphthalene-2-sulfonic acid 2 S1 S2 FCAM S2 XR AM S3 S4 1,5-Naphthalene disulfonic 1 AM FC FC FC XR FC FC FCS1 acid 1,5-Naphthalene disulfonic 2 XR AM FA FA/FC FA/FC XR FA AM S1acid Camphor-10-sulfonic acid 1 S1 S1 FC S1 S1 S1 S1 S1 S2Camphor-10-sulfonic acid 2 AM AM FA/FC XR/S1 S1/XR AM FC AM AM S1 =salt, polymorphic form 1 S2 = salt, polymorphic form 2 S3 = salt,polymorphic form 3 S4 = salt, polymorphic form 4 SP = salt, partiallycrystalline FA = free acid FC = free Compound 1 XR = different XRPDpattern, but only a few peaks in the diffractogram (possibly indicatingdegradation) AM = amorphous GM = solid that rapidly converts to gum uponisolation

Example 2 Primary Salt Screen

For the potential salts obtained during the primary salt screen inExample 1, the samples were set-up for 1 week stability studies at 40°C./75% RH (open vials) and 80° C. (open vials). TGA was carried outafter the stability studies for samples containing sufficient material.The solubility of the samples was also tested in an aqueous medium(pH<2). The results for the stability and solubility studies areindicated in Table 2.

TABLE 2 Stability and solubility results from potential salts obtainedin the primary salt screen Approximate Solubility 40° C./75% RH 80° C.(open Potential Salt Form (mg/ml) (open conditions) conditions) 2,4,6-Form I Below LOQ No form change, No form change, Trihydroxybenzoateremains predominantly remains predominantly crystalline crystalline2,4,6- Form II Below LOQ No form change, but No form change, butTrihydroxybenzoate poor crystallinity poor crystallinity Besylate (1equiv.) Form I 0.047 No form change, No form change, remainspredominantly remains predominantly crystalline crystalline Besylate (1equiv.) Form II 0.055 No form change, some No form change, some declinein crystallinity. decline in crystallinity. Besylate (2 equiv.) Form I4.264 Solid/gum present. No form change, Change in polymorphic remainspredominantly form (likely hydrated), crystalline. TGA shows but poorcrystallinity. initial 1.95% weight loss likely due to unboundvolatiles. No further weight losses present prior to likely degradation.Besylate (2 equiv.) Form II 0.044 No form change, No form change,remains predominantly remains crystalline predominantly crystallineHydrochloride Form I 0.400 No form change, No form change, (1 equiv.)partially crystalline. poorly crystalline Hydrochloride Form I 0.196 Noform change, No form change, (2 equiv.) remains predominantly remainscrystalline. TGA shows predominantly initial weight loss of ca.crystalline 2% likely due to unbound volatiles. A further ca. 8% weightloss from ca. 150° C., directly followed by further weight loss likelydue to degradation. Likely hydrated or solvated. Maleate Form I 0.168 Noform change, No form change, remains predominantly remains crystalline.TGA shows predominantly a weight loss of ca. 11% crystalline. from ca.160° C. The required DCM content for a mono DCM solvate is 11.23%.Maleate Form II 0.271 No form change, No form change, remainspredominantly remains crystalline. TGA shows predominantly an initial1.76% weight crystalline loss likely due to unbound volatiles. A furtherca. 6.3% weight loss is seen from ca. 130° C., likely due to boundsolvent/water. Maleate Form III 0.251 No clear form change No clear formchange but poorly crystalline but poorly crystalline (brown) (brown)Mesylate Form I 7.286 Gum formed Amorphous solid Oxalate Form I 0.158 Noform change, No form change, remains predominantly remains crystalline.TGA shows predominantly a weight loss of ca. crystalline. 14.4%associated with an endotherm at ca. 200° C. Oxalate Form II 0.22 No formchange, Amorphous brown remains predominantly solid crystalline Tosylate(1 equiv.) Form I 0.104 No form change, No form change, remainspredominantly partially crystalline crystalline Tosylate (1 equiv.) FormII 0.422 Gum formed Possible form change, partially crystalline Tosylate(2 equiv.) Form I 0.089 No form change, No form change, remainspredominantly remains crystalline predominantly crystalline Tosylate (2equiv.) Form II 0.303 Gum formed Possible form change, partiallycrystalline 1,2-Ethane disulfonic Form I 0.21 Significant loss inSignificant loss in acid (1 eq.) crystallinity crystallinity 1,2-Ethanedisulfonic Form II 0.62 No form change but Significant loss in acid (1eq.) some loss in crystallinity crystallinity 1,2-Ethane disulfonic FormI 0.34 No form change, No form change, acid (2 eq.) remains partiallyremains partially crystalline. crystalline. TGA showed an initial weightloss of 6.28% which could indicate potential solvation (8.4% requiredfor 1 equiv. of MEK). No other weight losses prior to degradation.1,2-Ethane disulfonic Form II 0.25 XRPD predominantly XRPD predominantlyacid (2 eq.) similar to input material. similar to input material.Partially crystalline. TGA showed an initial weight loss of 3.7%, whichcould indicate potential hydration or hygroscopic material (monohydratewould have 2.23% water). No other weight losses prior to degradation.HBr (1 eq.) Form I 1.27 No form change, slight No Form change. (Form Ifor both 1 loss in crystallinity. Slight loss in and 2 equiv. was thecrystallinity. same form) TGA showed an initial weight loss of 0.83%probably due to unbound volatiles. No other weight losses prior todegradation. HBr (2 eq.) Form II 2.38 Changed to Form I, Potential newform, poorly crystalline. but poorly crystalline Naphthalene-2- Form I0.34 No form change, small No form change, sulfonic acid (1 eq.) loss incrystallinity small loss in crystallinity TGA showed an initial weightloss of 1.86% probably due to unbound volatiles. No other weight lossesprior to degradation. Naphthalene-2- Form I 0.87 No form change, poor Noform change, poor sulfonic acid crystallinity. crystallinity (2 eq.)Naphthalene-2- Form II 0.86 No form change, No form change, but sulfonicacid remains partially loss of crystallinity (2 eq.) crystalline. TGAshowed an initial weight loss of 0.71% probably due to unbound volatilesand a second loss of 1.61% associated with the melt (ca. 138° C.) whichcould indicate some bound water or solvent (monohydrate would have 1.82wt % water). Naphthalene-2- Form III 0.74 Converted to Form II,Converted to Form II, sulfonic acid but partially crystalline. butpartially (2 eq.) crystalline. TGA showed an initial weigh loss of 1.41%probably due to unbound volatiles and a second loss of 1.32% associatedwith the melt (ca. 135° C.). Could indicate some bound water or solvent.Naphthalene-2- Form IV 0.76 Converted to Form II, Converted to Form II,sulfonic acid (2 but poorly crystalline. but poorly crystalline. eq.)1,5 Naphthalene Form I Below LOQ No form change, Possible form change,disulfonic acid (1 remains partially but poorly crystalline. eq.)crystalline. TGA showed an initial weight loss of 2.94% probably due tounbound volatiles and another weight loss of 6.00%, which could indicatepotential salvation (mono acetonitrile solvate would have ca. 4.29 wt%). No other weight loss prior to degradation. 1,5 Naphthalene Form IBelow LOQ No form change, but Predominantly disulfonic acid (2 eq.) lossin crystallinity. amorphous. Camphor-10-sulfonic Form I 1.05 No formchange, slight No form change, acid loss in crystallinity slight loss in(1 eq.) TGA showed an initial crystallinity weight loss of 2.13%probably due to unbound volatiles. No other weight loss prior todegradation. Camphor-10-sulfonic Form II 0.58 Mixture of Form I andConverted to Form I, acid Form II. Some loss in partially crystalline.(1 eq.) crystallinity. TGA showed a 3.3% weight loss between 25-120° C.Possible bound and unbound water/solvent present. No other weight lossesprior to degradation. Camphor-10-sulfonic Form I 0.89 AmorphousAmorphous acid (2 eq.)

From these results the bis-besylate salt was selected to be scaled up,using acetone as the solvent. In addition, the hydrobromide salt wasselected to be scaled up, using acetonitrile:water (90:10) as thesolvent. The mono-maleate and bis-hydrochloride salts were also selectedfor scale-up experiments to assess whether these are solvated/hydrated.

Example 3 Secondary Screen of Bis-Besylate Salt

Approximately 5 mL of acetone was added to approximately 800 mg ofCompound 1 to form a slurry. In a separate vial, approximately 3 mLacetone was added to 2 equivalents of benzenesulfonic acid to dissolvethe acid. The acid solution was then added in small aliquots to the freebase slurry while stirring. After the complete addition of the acid, agum/oil-like material initially formed, however, this converted to asolid after ca. 30 minutes of stirring. The reaction was stirred for ca.1.5 days before being isolated and dried. The material was initiallydried at ambient under vacuum (ca. 22° C.) for 3 days, however,approximately 6.7% acetone was still present at this stage. A portionwas then dried for a further 2 days at 40° C. under vacuum after whichca. 2.7% acetone remained. The material was then dried for a further 2days at 60° C. under vacuum. The yield was 1.1 g of material (86%).

To examine whether the citric acid in the buffers was having an effecton the solubility values obtained for pH 3, 4.5 and 6.6, thethermodynamic solubility experiments were repeated at these pH valuesusing KHP/HCl for pH 3, KHP/NaOH for pH 4.5 and phosphate/NaOH for pH6.6. The remaining solids were also analysed by XRPD analysis toestablish if any changes in the solid form occurred.

XRPD analysis (FIG. 1) showed the material to be crystalline. Thediffractogram is consistent with the small scale bis-besylate Form Idiffractograms obtained during the primary salt screen.

TGA/DTA was carried after 3 days of drying at ambient under vacuum aswell as after further drying for 2 days at 40° C. under vacuum and 2days at 60° C. under vacuum. After the ambient drying process, the TGAshowed a 6.7% weight loss between ca. 50-150° C. (FIG. 2) (for anacetone solvate, 1 mole equivalent of acetone would be ca. 6.3 wt %).After further drying, the TGA showed a 0.47% weight loss from theoutset, likely due to unbound moisture or solvent. A further small 0.16%weight loss corresponded with the endotherm at onset ca. 142° C. (FIG.3).

DSC analysis (FIG. 4) indicated a broad endotherm from the outset likelydue to unbound solvent. A second endotherm was present at onset ca.139.4° C. (peak 146.1° C.).

Polarised Light Microscopy (not shown) showed birefringent particleswith no clearly defined morphology present.

IR spectroscopy (FIG. 5) showed a number of differences and shifts incomparison with the freebase and benzenesulfonic acid.

¹H NMR spectroscopy (FIG. 6) indicated that a number of the Compound 1and benzenesulfonic acid peaks appear to be overlapping, however, thestoichiometry is approximately 2:1 benzenesulfonic acid: Compound 1. Theacetone present does not appear to be a stoichiometric amount.

DVS analysis (FIG. 7) showed a water uptake of ca. 2.2% between 20 and70% RH. The difference between the mass of the first sorption cycle andthe desorption and second sorption cycle at 20% RH is likely due to theloss of excess acetone in the first cycle. The material also appears tohydrate during DVS analysis as indicated by the change in polymorphicform seen by post DVS XRPD analysis (not shown). The XRPD diffractogramalso showed some loss in crystallinity.

Karl Fischer Coulometry indicated a ca. 0.77% water content (Note: dueto the manual introduction of the solid material into the titrationcell, measured values below 1% are generally slightly higher than theactual water content).

The HPLC purity evaluation (not shown) indicated a purity of ca. 97.6%for the bis-besylate salt with the main peak eluting at a retention timeof ca. 13.05 minutes.

Slurries of the bis-besylate salt were created in acetone:water mixtures(3%, 5% and 10%) and stirred at ambient for ca. 4 days. The resultingsolids were then analyzed by XRPD to determine if any changes hadoccurred on slurrying. The hydration study results from XRPD analysis(FIG. 8) are summarised in Table 3.

TABLE 3 Hydration Study Results Solvent System Result of slurryingAcetone:water (3%) Corresponds with the input bis- besylate saltmaterial. Acetone:water (5%) Appears to be a mixture of the inputmaterial and a possible hydrate. Acetone:water (10%) Different from thebis-besylate input material, likely hydrated. Peaks correspond with postDVS XRPD peaks.

The bis-besylate salt was slurried in deionized water at ambienttemperature (ca. 22° C.). A sample of solid was taken at 24 & 48 hoursand analysed by XRPD. The pH of the supernatant was also monitored. TheSalt Disproportionation study results from XRPD analysis (FIG. 9) aresummarised in Table 4.

TABLE 4 Disproportionation Study Results Timepoint Solvent System Resultof slurrying 1 hr pH 2-3 Yellow gum present. 24 hrs pH 1-2 Differentfrom starting material, appears to have hydrated (corresponds withAcetone:water (90:10%) hydration sample). 48 hrs pH 1-2 Different fromstarting material, appears to have hydrated (corresponds withAcetone:water (90:10%) hydration sample).

The bis-besylate salt was exposed to environments of 40° C./75% RH(relative humidity, open and closed vial) and 80° C. (open vial) for 1week to determine stability. Resulting solids were analysed by XRPD andHPLC to establish if any changes had occurred. The 1 Week stabilitystudy results from XRPD (FIG. 10) and HPLC analysis (not shown) at 40°C./75% RH using an open and closed vial and 80° C. using an open vialare indicated Table 5.

TABLE 5 1 Week Stability Study Results Storage Condition HPLC XRPD 40°C./75% RH 97.22% Change in polymorphic form, likely due (open vial) tohydration. 40° C./75% RH 97.35% No change in polymorphic form. (crimpedvial) 80° C. 97.20% Corresponds predominantly with input (open vial)material, with loss in crystallinity.

Slurries of the bis-besylate salt were created in media of various pH(pH 1; pH 3; pH 4.5 and pH 6.6) and shaken for ca. 24 hours. After 24hours, the slurries were filtered and the solution analysed by HPLC inorder to determine the solubility at the various pH levels. Theremaining solids were also analysed by XRPD analysis to establish if anychanges in the solid form occurred. For the buffer solutions, KCl/HClwas used for pH 1 and citrate/phosphate combinations for pH 3, 4.5 and6.6. Thermodynamic solubility studies indicated the results shown inTable 6.

TABLE 6 Thermodynamic Solubility Results Solubility pH Buffers used(mg/ml) XRPD of excess solids (FIG. 11) pH 1.0 KCl/HCl 4.93 mg/mlDiffractogram corresponds with the hydrated bis-besylate. pH 3.0Citrate/Phosphate 0.24 mg/ml Change in diffractogram - does notcorrespond with any known forms of the bis-besylate or Compound 1. Doesnot correspond with the solids used in the buffers. pH 4.5Citrate/Phosphate 0.43 mg/ml Change in diffractogram - does notcorrespond with any known forms of the bis-besylate or Compound 1. Doesnot correspond with the solids used in the buffers. pH 6.6Citrate/Phosphate 0.66 mg/ml Change in diffractogram - does notcorrespond with any known forms of the bis-besylate or Compound 1. Doesnot correspond with the solids used in the buffers. pH 3.0 KHP/HCl 0.26mg/ml Change in diffractogram - does not correspond with any known formsof the bis-besylate or Compound 1. Does not correspond with the solidsused in the buffers. pH 4.5 KHP/NaOH 0.10 mg/ml Change indiffractogram - does not correspond with any known forms of thebis-besylate or Compound 1. Does not correspond with the solids used inthe buffers. pH 6.6 Phosphate/NaOH 0.17 mg/ml Change in diffractogram -does not correspond with any known forms of the bis-besylate orCompound 1. Does not correspond with the solids used in the buffers.

When initially setting up the slurries for thermodynamic solubilitydeterminations, gums were obtained in all of the pH media used, however,upon shaking, the gums converted to solids after ca. 2 hours. The XRPDanalysis of the excess solid from the slurries after the solubilityexperiments, indicate that for pH 1, the bis-besylate salt hydrateswhile slurrying. Hence, the solubility value obtained is likely anindication of the solubility of the hydrated material. Thediffractograms for the remaining samples appear different from the inputmaterial as well as all identified forms of the bis-besylate andCompound 1 free base. The diffractograms also appear different from thediffractograms of the solids used to make up the buffers. The solubilityvalues obtained using these pH buffers are likely not representative ofthe bis-besylate salt which was initially placed into the solutions.

Approximately 100-120 mg of each form was compressed into discs byplacing the material into a die (diameter: 13 mm) and compressing thedie under 5 tons of pressure in a hydraulic press for ca. 2 minutes. ASotax AT7 (conformed to EP2 and USP2) dissolution instrument was usedcontaining paddles to stir the media at 100 rpm. Dissolution media of pH3 (1% SDS) and pH 4.5 (1% SDS) were prepared using citrate/phosphatebuffer. All materials were tested in 750 ml of the buffer medium. Discswere added at time=0 seconds and allowed to sink to the bottom of thedissolution vessel before stirring began. ca. 1 ml aliquots of mediawere extracted from the dissolution vessels at times 1, 5, 10, 15, 30,60, 120, 240 minutes and 24 hours, and tested for dissolved saltconcentration by HPLC-UV. The dissolution tests were carried out induplicate. For both dissolution media, the peak areas for the initialtime points (up to 15 minutes), fell below the limit of quantification,however, when plotting Dissolution rate vs. time, the steepest part ofthe curve occurs during these early time points.

For pH 4.5, when plotting the curve of Dissolution rate vs. Time (FIG.12), the intrinsic dissolution values obtained from the early timepoints on the curve (steepest part of the curve) were approximately 0.61mg/cm²/min for both tablets 1 and 2. At the later time points, intrinsicdissolution values of 0.09 mg/cm²/min and 0.08 mg/cm²/min were obtainedfor tablets 1 and 2, respectively.

For pH 3.0, when plotting the curve of Dissolution rate vs. Time (FIG.13), the intrinsic dissolution values obtained from the early timepoints on the curve (steepest part of the curve) were approximately 0.36mg/cm²/min for tablet 1 and 0.38 mg/cm²/min for tablet 2. At the latertime points, intrinsic dissolution values of 0.08 mg/cm²/min and 0.07mg/cm²/min were obtained for tablets 1 and 2, respectively.

Example 4 Secondary Screen of Bis-Besylate Hydrate Salt

Approximately 3 mL of acetone was added to ca. 500 mg of Compound 1 toform a slurry. In a separate vial, ca. 1 mL of acetone was added to 2equivalents of benzenesulfonic acid in order to dissolve the acid. Theacid solution was then added in small aliquots to the freebase slurrywhile stirring. The reaction was stirred for ca. 1 day while temperaturecycling between 0 and ambient temperature (ca. 22° C.). After 1 day,deionized water was added to the reaction mixture and the slurry wasallowed to stir for ca. 3 hours before being isolated and dried atambient under vacuum.

XRPD analysis (FIG. 14) showed the material to be crystalline. Thediffractogram is consistent with the bis-besylate hydrate obtained fromthe hydration studies of the bis-besylate salt.

TGA/DTA indicated a weight loss of ca. 2.1% between ca. 70-100° C. (FIG.15). This corresponds approximately with the 2.03 wt % water requiredfor a monohydrate. A ca. 2.2% weight loss was present from the outset toca. 70° C., likely due to unbound water. Although the total ca. 4.2%weight loss corresponds approximately with a dihydrate, the first weightloss occurs from the outset followed by a second clear weight losscorresponding with mono amounts of water. As the first weight lossoccurs from ca. 25° C., this would likely be due to unbound water.

DSC analysis indicated a broad endotherm between ca. 40-115° C. Twofurther endotherms were then present at onset 119.7° C. (peak 134.3° C.)and onset 153.8° C. (peak 165.1° C.) (FIG. 16).

PLM analysis showed some birefringence, however the particle size isvery small and no clear morphology could be seen (not shown). Hot-stagemicroscopy was carried out on a sample of the bis-besylate hydrate. Novisual changes could be observed prior to the material melting anddegrading (turned brown) at ca. 160° C.

IR analysis (FIG. 17) showed differences from both the free base andbenzenesulfonic acid spectra as well as some differences when comparingthe spectra of the input bis-besylate salt with that of the hydratedmaterial.

¹H NMR spectroscopy (FIG. 18) indicated that a number of the Compound 1and benzenesulfonic acid peaks appear to be overlapping, however, thestoichiometry appears to be approximately 2:1 benzenesulfonic acid:Compound 1. A small non-stoichiometric amount of acetone was present inthe spectrum.

DVS analysis (FIG. 19) showed a water uptake of ca. 1.3% between 20 and70% RH. No hysteresis was seen between the sorption and desorptioncycles. The XRPD diffractogram of the material post DVS analysis wasconsistent with the diffractogram of the input bis-besylate hydratematerial (not shown).

The 1 week stability data at 40° C./75% RH (open container) indicatedthat by XRPD, the material remained consistent with the input materialwith no changes in polymorphic form (FIG. 20).

HPLC purity determinations indicated an initial purity of ca. 98.4% anda purity of ca. 98.3% after 1 week storage at 40° C./75% RH.

Thermodynamic solubility studies of the bis-besylate hydrate indicatedthe results shown in Table 7.

TABLE 7 Thermodynamic Solubility Results Solubility pH Buffers (mg/ml)XRPD of excess solids (FIG. 21) pH 1.0 KCl/HCl  4.39 mg/ml Very littlesolid present for XRPD, however the peaks which are visible in thediffractogram appear to correspond with the hydrated bis-besylatediffractogram. pH 3.0 Citrate/Phosphate 0.016 mg/ml Very little solidpresent for XRPD, however, a change in the diffractogram is seen whereit does not correspond with any identified forms of the bis-besylatesalt or Compound 1. It also does not correspond with the solids used inthe buffers. pH 4.5 Citrate/Phosphate Below Very little solid presentfor XRPD, however, LOQ a change in the diffractogram is seen where itdoes not correspond with any identified forms of the bis-besylate saltor Compound 1. It also does not correspond with the solids used in thebuffers. pH 6.6 Citrate/Phosphate Not Very little solid present forXRPD, however, detected by a change in the diffractogram is seen whereHPLC it does not correspond with any identified forms of thebis-besylate salt or Compound 1. It also does not correspond with thesolids used in the buffers.

Intrinsic dissolution tests were carried out using pH 4.5 (1% SDS) andpH 3.0 (1% SDS). For both dissolution media, the peak areas for theinitial time points (up to 15 minutes), fell below the limit ofquantification, however when plotting Dissolution rate vs. time, thesteepest part of the curve occurs during these early time points. For pH4.5, when plotting the curve of Dissolution rate vs. Time (FIG. 22), theintrinsic dissolution values obtained from the early time points on thecurve (steepest part of the curve) were approximately 0.43 mg/cm²/minfor tablet 1 and 0.44 mg/cm²/min for tablet 2. At the later time points(toward the end of the dissolution study), intrinsic dissolution valuesof 0.012 mg/cm²/min and 0.006 mg/cm²/min were obtained for tablets 1 and2, respectively.

For pH 3.0, when plotting the curve of Dissolution rate vs. Time (FIG.23), the intrinsic dissolution values obtained from the early timepoints on the curve (steepest part of the curve) were approximately 0.38mg/cm²/min for tablet 1 and 0.39 mg/cm²/min for tablet 2. At the latertime points, intrinsic dissolution values of 0.01 mg/cm²/min for bothtablets 1 and 2 were obtained.

A larger batch of the bis-besylate hydrate salt was prepared using thefollowing procedure. Approximately 20 mL of acetone was added to ca. 14g of Compound 1 in a round bottomed flask to form a slurry. In aseparate flask, ca. 10 mL of acetone was added to 2 equivalents ofbenzenesulfonic acid in order to dissolve the acid. The acid solutionwas then added in small aliquots to the freebase slurry whilst stirringat ca. 0° C. The resulting slurry was then allowed to stir at ambientfor ca. 2 hours. It was then placed at ca. 5° C. for 2 days beforestirring for a further 3 hours at ambient temperature. The acetone wasthen removed and ca. 20 mL of water was added to the material. Theslurry was temperature cycled (0° C.—ambient temperature (ca. 22° C.))in 2 hour cycles for ca. 1 day. The solid was then isolated byfiltration and allowed to dry at ambient conditions under vacuum beforeanalysis. The drying was continued for ca. 10 days.

The properties of the material from this larger batch were similar tothose described above. In addition to those properties, it was notedthat when the bis-besylate hydrate was left on the bench for 2 hours andTGA was again carried out, the sample seemed to pick up the water tohave a total ca. 4.5% weight loss in the final TGA. It does not appearto be possible to remove the remaining 2% of unbound water by drying asthis is regained when exposed to ambient conditions. Also, KF titrationdetermined the water content of the material to be ca. 3.97%. While theca. 4 wt % water would correspond theoretically with a dihydrate, theweight loss in the TGA appears to start from the outset followed by amore clear second weight loss which corresponds approximately with 1equivalent of water. The material likely shows some hygroscopicityresulting in the initial TGA weight loss.

Example 5 Secondary Screen of Mono-Maleate Salt

Approximately 3 mL of dichloromethane was added to ca. 200 mg ofCompound 1 to form a slurry. In a separate vial, ca. 1 mL ofdichloromethane was added to 1 equivalent of maleic acid in order todissolve the acid. The acid solution was then added in small aliquots tothe freebase slurry while stirring. The slurry obtained was yellow incolor. The reaction was stirred for ca. 1.5 days between 0° C. andambient temperature (ca. 22° C.) and remained at ca. 4° C. for a further2 days before being isolated and dried at ambient. The material wasdried at ambient temperature under vacuum (ca. 22° C.) for ca. 2 days.

XRPD analysis (FIG. 24) showed the material to be crystalline. Thediffractogram is consistent with the small scale mono-maleate Form Idiffractogram obtained during the primary salt screen.

TGA/DTA was carried after 2 days of drying at ambient under vacuum. TheTGA showed a 0.4% weight loss from the outset, likely due to unboundmoisture or solvent. A large 10.9% weight loss is associated withendothermic/exothermic events in the DTA between ca. 145-185° C.,followed by further weight losses due to likely degradation (FIG. 25).

DSC analysis indicated an endotherm at onset 160.4° C. (peak 163.8° C.),directly followed by an exotherm, likely due to recrystallisation andthen final degradation (FIG. 26).

¹H NMR spectroscopy (FIG. 27) indicated approximately 1:1 stoichiometryof Compound 1: maleic acid. Dichloromethane was not present in thespectrum. Therefore, the mono-maleate salt does not appear to besolvated.

Example 6 Secondary Screening of Bis-hydrochloride Salt (Form I)

Approximately 1.5 mL of acetonitrile:H₂O (90:10) was added to ca. 200 mgof Compound 1 to form a slurry. In a separate vial, ca. 1 mL ofacetonitrile:H₂O (90:10) was added to 2 equivalents of hydrochloricacid. The acid solution was then added in small aliquots to the freebaseslurry while stirring. The reaction was stirred for ca. 1.5 days between0° C. and ambient temperature (ca. 22° C.) and remained at ca. 4° C. fora further 2 days before being isolated and dried at ambient temperature.The material was dried at ambient temperature under vacuum (ca. 22° C.)for ca. 2 days.

XRPD analysis (FIG. 28) showed the material to be crystalline. Thediffractogram is consistent with the small scale bis-hydrochloride FormI diffractogram obtained during the primary salt screen.

TGA/DTA was carried after 2 days of drying at ambient under vacuum. TheTGA showed a 2.7% gradual weight loss from the outset to ca. 180° C. Afurther 4.3% weight loss is seen between ca. 180-210° C., whichcorresponds with an endotherm in the DTA trace (FIG. 29).

DSC analysis indicated a broad endotherm between ca. 30-160° C. Afurther endotherm is then present at onset 206.4° C. (peak 226.5° C.),directly followed by a smaller endotherm at peak 238.2° C. (FIG. 30).

Karl Fischer analysis showed ca. 3.3% water content (ca. 2.8% waterrequired for a monohydrate).

¹H NMR spectroscopy (FIG. 31) indicated that the spectrum had shifted incomparison with Compound 1, indicating likely salt formation. No signsof degradation could be seen. The free base peak appears to be partiallyoverlapping with the region for acetonitrile, however, no significantamounts of acetonitrile appear to be present.

Example 7 Secondary Screening of Hydrobromide Salt (1 Equiv.)

Approximately ca. 5 mL of acetonitrile:water (10%) was added to ca. 1 gof Compound 1 free base to form a slurry. In a separate vial, ca. 3 mLof acetonitrile:water (10%) was added to 1 equivalent of hydrobromicacid (48%). The acid solution was then added dropwise over a 1 hourperiod to the free base slurry whilst stirring and maintaining atemperature between 0-5° C. After the complete addition of the acid, afurther 3 mL of acetonitrile:water (10%) was added. The reaction wasstirred for ca. 1 day before being isolated and dried under vacuum atambient (ca. 22° C.). A yield of ca. 79% was obtained.

XRPD analysis (FIG. 32) was carried out on the wet sample and afterdrying. The analysis indicated that the material undergoes a form changeupon drying. The diffractogram of the scaled up material, both beforeand after drying, was different from the diffractogram of the primaryscreen hydrobromide sample.

TGA/DTA showed a 1.01% weight loss from the outset, likely due tounbound moisture or solvent. No further weight losses were seen prior todegradation at onset ca. 230° C. (FIG. 33).

DSC analysis (FIG. 34) indicated a broad endotherm from the outsetlikely due to unbound solvent/water. A second endotherm was then seen atonset ca. 230° C. (peak 238° C.), followed by likely degradation.

Polarised Light Microscopy showed very small particles with no clearlydefined morphology present (not shown).

IR spectroscopy (FIG. 35) showed a number of differences and shifts incomparison with the freebase.

¹H NMR spectroscopy (FIG. 36) indicated a number of peak shifts incomparison with the freebase.

DVS analysis (FIG. 37) showed a water uptake of 0.97% between 20 and 70%RH. The water uptake between 0-90% RH is reversible showing very littlehysteresis. Post DVS XRPD analysis indicated that the polymorphic formappears to remain consistent after exposure to varying RH % conditions(not shown).

Karl Fischer Coulometry indicated a ca. 1.65% water content.

The HPLC purity evaluation indicated a purity of ca. 97.5% for thehydrobromide salt with the main peak eluting at a retention time of ca.13 minutes.

Slurries of the hydrobromide salt were created in acetone:water mixtures(3%, 5% and 10%) and stirred at ambient for ca. 3 days. The resultingsolids were then analysed by XRPD to determine if any changes hadoccurred on slurrying. The hydration study results from XRPD analysis(FIG. 38) are summarised in Table 8.

TABLE 8 Hydration Study Results Solvent System Result of slurryingAcetone:water (3%) Corresponds with the input hydrobromide form.Improvement in crystallinity. Acetone:water (5%) Corresponds with theinput hydrobromide form. Improvement in crystallinity. Acetone:waterCorresponds with the input hydrobromide form. (10%) Improvement incrystallinity.

The hydrobromide salt was slurried in deionised water at ambienttemperature (ca. 22° C.). A sample of solid was taken at 1, 24 & 48hours and analysed by XRPD. The pH of the supernatant was alsomonitored. The Salt Disproportionation study results from XRPD analysis(FIG. 39) are summarised in Table 9.

TABLE 9 Disproportionation Study Results Time point pH XRPD 1 hr pH 1The material appears to be a mixture of the input hydrobromide materialand a solid form that was also obtained from slurrying the material inthe various pH solutions during thermodynamic solubility studies. 24 hrspH 1 The material appears to be a mixture of the input hydrobromidematerial and a solid form which was obtained from slurrying the materialin the various pH solutions during thermodynamic solubility studies. 48hrs pH 1 The material appears to be a mixture of the input hydrobromidematerial and a solid form which was obtained from slurrying the materialin the various pH solutions during thermodynamic solubility studies.

The hydrobromide salt was exposed to environments of 40° C./75% RH (openand closed vial) and 80° C. (open vial) for 1 week to determinestability. Resulting solids were analysed by XRPD and HPLC to establishif any changes had occurred. The 1 Week stability study results fromXRPD (FIG. 40) and HPLC analysis at 40° C./75% RH using an open andclosed vial and 80° C. using an open vial are indicated Table 10.

TABLE 10 1 Week Stability Study Results Condition HPLC XRPD 40° C./75%RH 97.2% No polymorphic form changes observed (closed vial) duringstorage. 40° C./75% RH 97.2% No polymorphic form changes observed (openvial) during storage. 80° C. open vial 97.1% No polymorphic form changesobserved during storage.

Slurries of the hydrobromide salt were created in media of various pH(pH 1; pH 3; pH 4.5 and pH 6.2) and shaken for ca. 24 hours. After 24hours, the slurries were filtered and the solution analyzed by HPLC inorder to determine the solubility at the various pH levels. Theremaining solids were also analysed by XRPD analysis to establish if anychanges in the solid form occurred. For the buffer solutions, KCl/HClwas used for pH 1 and citric acid/sodium citrate combinations for pH 3,4.5 and 6.2. The thermodynamic solubility studies indicated the resultsshown in Table 11.

TABLE 11 Thermodynamic Solubility Results Buffers Solubility pH used(mg/ml) XRPD of excess solids (FIG. 41) pH 1.0 KCl/HCl 3.78 Appearspredominantly amorphous by XRPD analysis. Solid material converted to agum after being placed onto an XRPD sample holder as a slurry. pH 3.0Citric 0.21 The diffractogram appears different from the input acid/hydrobromide material, all known forms of the Sodium Compound 1 freebase and the citric acid used in buffer Citrate preparation. Thediffractogram also appears to correspond with the diffractogramsobtained for the thermodynamic solubility experiments carried out on thebis-besylate salt. pH 4.5 Citric 0.08 The diffractogram appearsdifferent from the input acid/ hydrobromide material, all known forms ofthe Sodium Compound 1 free base and the citric acid used in bufferCitrate preparation. The diffractogram also appears to correspond withthe diffractograms obtained for the thermodynamic solubility experimentscarried out on the bis-besylate salt. pH 6.2 Citric 0.03 Thediffractogram appears different from the input acid/ hydrobromidematerial, all known forms of the Sodium Compound 1 free base and thecitric acid used in buffer Citrate preparation. The diffractogram alsoappears to correspond with the diffractograms obtained for thethermodynamic solubility experiments carried out on the bis-besylatesalt.

The diffractograms for the pH 3.0, 4.5 and 6.2 experiments appeareddifferent from the input material as well as all identified forms of thehydrobromide salt and Compound 1 free base. The diffractograms alsoappeared different from the diffractograms of the solids used to make upthe buffers. The solubility values obtained using these pH buffers aretherefore likely not representative of the hydrobromide salt which wasinitially placed into the solutions.

Approximately 100-120 mg of material was compressed into discs byplacing the material into a die (diameter: 13 mm) and compressing thedie under 5 tons of pressure in a hydraulic press for ca. 2 minutes. ASotax AT7 (conformed to EP2 and USP2) dissolution instrument was usedcontaining paddles to stir the media at 100 rpm. Dissolution media of pH3 (1% SDS) and pH 4.5 (1% SDS) were prepared using citrate/phosphatebuffer. All materials were tested in 750 ml of the buffer medium. Discswere added at time=0 seconds and allowed to sink to the bottom of thedissolution vessel before stirring began. ca. 1 ml aliquots of mediawere extracted from the dissolution vessels at times 1, 5, 10, 15, 30,60, 120, 240 minutes and 24 hours, and tested for API concentration byHPLC-UV. The dissolution tests were carried out in duplicate. For bothdissolution media, the peak areas for the initial time points (up to 15minutes), fell below the limit of quantification, however, when plottingDissolution rate vs. time, the steepest part of the curve occurs duringthese early time points.

For pH 4.5, when plotting the curve of Dissolution rate vs. Time (FIG.42), the intrinsic dissolution values obtained from the early timepoints on the curve (steepest part of the curve) were approximately 0.27mg/cm²/min for tablet 1 and 0.28 mg/cm²/min for tablet 2.

For pH 3.0, when plotting the curve of Dissolution rate vs. Time (FIG.43), the intrinsic dissolution values obtained from the early timepoints on the curve (steepest part of the curve) were approximately 0.35mg/cm²/min for both tablets 1 and 2.

Example 8 Secondary Screening of Hydrobromide Salt (2 Equiv.)

Approximately 1 ml of methanol was added to ca. 200 mg of Compound 1 toform a slurry. In a separate vial, ca. 1 mL of methanol was added to 2equivalents of hydrobromic acid (48%). The acid solution was then addeddropwise over a 1 hour period to the free base slurry whilst stirringand maintaining a temperature between 0-5° C. After the completeaddition of the acid, a further 1 mL of methanol was added. The reactionwas stirred for ca. 3 hours before being isolated and dried. A yield ofapproximately 68% was obtained.

XRPD analysis (FIG. 44) was carried out after filtration and thediffractogram obtained was consistent with the Form I material obtainedusing both 1 and 2 equivalents of HBr in the primary salt screen.

TGA/DTA (FIG. 45) showed a 1.2% weight loss from the outset to ca. 100°C., likely due to unbound moisture or solvent. No further weight losseswere seen prior to degradation at onset ca. 230° C. The TGA/DTA issimilar to the trace obtained for the 1 equivalent scaled-up form ofExample 6.

IR spectroscopy (FIG. 46) showed a number of differences and shifts incomparison with the free base and the hydrobromide (1 equiv.) scaled-upsalt.

Example 9 Secondary Screening of Hydrobromide Salt (Unknown Form)

The thermodynamic solubility experiments carried out on the hydrobromidesalt resulted in the formation of an unknown solid form. In attempts tocharacterize this form, as well as establish the rate of conversion tothis form while slurrying the material, the following experiments werecarried out. Initially, approximately 100 mg of the hydrobromide (1equiv.) material was slurried in a pH 6.2 aqueous solution at ambientand XRPD analysis was carried out at time points 5 min., 1 hr, 2 hrs, 4hrs and 8 hrs. Further analysis was then also carried out on theconverted material.

The XRPD analysis (FIG. 47) carried out on the hydrobromide (1 equiv.)salt sample after slurrying the solid in an aqueous pH 6.2 medium for 5min, 1 hr, 2 hrs, 4 hrs and 8 hrs indicated that conversion to theunknown solid form occurs between 2-4 hours.

PLM analysis carried out on a slurry of the material indicated a verysmall particle size. Some birefringence was observed (not shown). Upondrying the material became glass-like.

¹H NMR analysis was carried out on this material which showed a spectrumwhich was different in terms of peak positions from both the free basespectrum and the hydrobromide spectrum (FIG. 48).

DSC analysis was also attempted on the glass-like material, however, alarge broad endotherm is seen from the outset to ca. 110° C., followedby a pattern characteristic of amorphous material (FIG. 49).

The slurry experiment of Compound 1 free base and the bis-besylatehydrate (carried out in attempts to produce more of this form foranalysis) were unsuccessful in producing this unknown solid form. Forthe free base slurry, the material remained as the free base Form I andfor the bis-besylate hydrate slurry, the material lost somecrystallinity, but remained as the bis-besylate hydrate (FIG. 50).

The further scale-up of the hydrobromide (1 equiv.) salt and subsequentslurrying in a pH 6.2 aqueous medium resulted in this unknown solid formbeing obtained (FIG. 51), however, all attempts at filtering thematerial were unsuccessful with the solid going through a sinteredfilter and multiple sheets of filter paper, due to the small particlesize. Again, attempts at evaporating off the solvent resulted in aglass-like material being obtained. This appears to indicate that theunknown form is unstable when isolated.

Example 10 Tertiary Screening of Hydrobromide Salt (1 Equiv.)

Approximately 85 mL of acetonitrile:water (90:10) was added to ca. 20 gof Compound 1 in a round bottomed flask to form a slurry. In a separateflask, 1 equivalent of hydrogen bromide (ca. 4.073 mL) was added to ca.70 mL of acetonitrile:water (90:10). The acid solution was then added insmall aliquots to the free base slurry while stirring at ca. 4° C. Theresulting slurry was then allowed to stir at ambient temperature for ca.2 hours. It was then placed at ca. 5° C. for 1 day before stirring for afurther 4 hours at ambient temperature. The reaction was then filteredand the solid dried under vacuum at ambient temperature (ca. 22° C.).The drying was continued for ca. 2 days. Due to the partiallycrystalline nature of the material after drying, the material was thenslurried in ca. 50 mL of an acetone:water (90:10) mixture. The reactionwas temperature cycled between ca. 4-22° C. in 1 hour cycles whilestirring for ca. 2 days. The reaction was then filtered and dried atambient for ca. 4 days before being analyzed. The yield after thefurther slurrying was 16.4 g (63%).

XRPD analysis (FIG. 52) carried out on the initial scale-up materialwhile wet, showed the sample to be highly crystalline. After drying, thesolid converted to a different polymorphic form and also lost somecrystallinity. XRPD analysis (FIG. 53) on the material after furtherslurrying in acetone:water (10%) and subsequent drying indicated acrystalline material. The diffractogram corresponded with the smallerscale hydrobromide sample obtained after drying during Example 1.

IR Spectroscopy (FIG. 54) showed differences when compared with the freebase spectrum. The spectrum also appeared consistent with the spectrumobtained for the hydrobromide salt in Example 1.

PLM (not shown) showed small particles with no defined morphology andlittle birefringence.

¹H NMR (FIG. 55) indicated a number of peak shifts in comparison withthe free base. A small non-stoichiometric amount of acetone was presentin the spectrum.

TGA/DTA (FIG. 56) showed a weight loss from the outset of ca. 0.4%,likely due to unbound moisture or solvent. No further significant weightlosses were seen prior to degradation at onset ca. 230° C.

DSC analysis (FIG. 57) indicated a shallow, broad endotherm from theoutset likely due to unbound solvent/water. A second endotherm was thenpresent at onset ca. 240° C. (peak 244° C.), followed by likelydegradation.

KF analysis determined the water content of the material to be ca.0.76%.

HPLC purity determination indicated a purity of ca. 98.1%.

The content of carbon, hydrogen and nitrogen in the material wasdetermined by placing the samples into a tin capsule, placed inside anautosampler drum of an elemental analysis system. The sample environmentwas purged by a continuous flow of helium and the samples dropped atpre-set intervals into a vertical quartz tube maintained at 900° C. Themixture of combustion gases was separated and detected by a thermalconductivity detector giving a signal proportional to the concentrationof the individual components of the mixture. The content of bromine inthe material was determined by oxygen flask combustion of the sample.Once the combustion and absorption into solution had occurred, thesamples were titrated using a calibrated Mercuric Nitrate solution.Elemental analysis (CHN and bromide) indicated the followingpercentages:

ELEMENT C H N Br % Theory 51.03 4.44 15.42 12.57 % Found 50.36 4.3216.47 12.11

Ion chromatography was carried out using a Metrohm 761 Compact IonChromatograph for the analysis of ions in aqueous solutions. Calibrationstandards were prepared from certified 1000 ppm stock solutions. Ionchromatography showed the presence of 12.38% bromide.

In order to examine the effect of removing the water which is retainedby the material, (despite extended periods of drying) a small sample washeated to 100° C. in a TGA pan and XRPD analysis was then carried out(FIG. 58). The analysis indicates some loss in crystallinity, however,the polymorphic form remains consistent after removing the ca. 0.5%water by heating. Nevertheless, the material appears to be slightlyhygroscopic.

Example 11 Large-Scale Preparation of Hydrobromide Salt (1 Equiv.)

Approximately 1 L of acetone:water (90:10) was added to ca. 319 g ofCompound 1 in a 5 L reaction vessel with the reactor temperature set to4° C. A suspension was obtained. The suspension was stirred at 450 rpm.In a separate flask, 1 equivalent of hydrogen bromide (48%)(ca. 65 mL)was added to ca. 750 mL of acetone:water (90:10). The acid solution wasthen added to the 5 L reactor over a 1 hour period, while maintaining atemperature of ca. 4° C. After 30 minutes, a further 700 mL ofacetone:water (90:10) was added to the reactor. After the completeaddition of the HBr solution, the reactor temperature was raised to 20°C. for 2 hours. The reaction was then again cooled to ca. 4° C. andmaintained at this temperature for a further 3 hours. The reactionmixture was then filtered and dried under vacuum at ambient temperature(ca. 22° C.) for 3 days. The solid was stirred periodically during thedrying process. The yield after drying was 258.1 g (71%).

XRPD analysis (FIG. 59) carried out on the initial scale-up materialwhile wet, showed the sample to be highly crystalline. After drying, thesolid converted to a different polymorphic form (FIG. 60). The driedmaterial is the same form as that obtained from the primary salt screen.

IR Spectroscopy (FIG. 61) showed differences when compared with thefreebase spectrum. The spectrum also appeared consistent with thespectra obtained for the hydrobromide salt prepared in Examples 1 and 7.

PLM analysis showed a needle-like, fibrous morphology when wet (notshown). Upon drying and hence polymorph conversion, the needle-likemorphology was lost with small particles resulting.

¹H NMR (FIG. 62) indicated a number of peak shifts in comparison withthe free base. Trace amounts of acetone were present in the spectrum.

TGA/DTA (FIG. 63) showed a weight loss from the outset of ca. 0.4%,likely due to unbound moisture or solvent. No further significant weightlosses were seen prior to degradation at onset ca. 230° C. Thus, thematerial appears to retain ca. 0.5% water at ambient conditions despiteextended periods of drying and therefore appears to be slightlyhygroscopic.

DSC analysis (FIG. 64) indicated a shallow, broad endotherm from theoutset likely due to unbound solvent/water. A second endotherm was thenpresent at onset ca. 241° C. (peak 245° C.), followed by likelydegradation.

KF analysis determined the water content of the material to be ca.0.74%.

HPLC purity determination indicated a purity of ca. 99.1%.

Slurries of the hydrobromide salt were prepared in buffered aqueousmedia at pH 1.0 (HCl/KCl buffer), pH 3.0 (citrate buffer), pH 4.5(citrate buffer) and pH 6.2 (citrate buffer) as well as in an aqueoussolution with pH reduced to below 2 using HBr (48%). The respectiveslurries were shaken for a period of 24 hours at 22° C. The solids werethen removed by filtration and tested by XRPD analysis. The motherliquors were analyzed by HPLC to determine API solubility. HPLCsolubility determination in various pH media showed the followingresults:

pH condition Conc. (mg/mL) Aqueous solution with pH 3.52 reduced tobelow 2 using HBr. pH 1.0 (HCl/KCl buffer) 4.09 pH 3.0 (citrate buffer)0.20 pH 4.5 (citrate buffer) 0.17 pH 6.2 (citrate buffer) 0.04

XRPD analysis of the solids recovered after the solubility experiments(FIG. 65) showed all samples to correspond predominantly with the inputhydrobromide salt material, with the samples in the pH 3.0, 4.5 and 6.2buffers showing traces of a form previously identified fromdisproportionation studies and previous slurring of the hydrobromidesalt in pH buffers>pH 3.

Elemental analysis (CHN and bromide) indicated the followingpercentages:

ELEMENT C H N Br % Theory 51.03 4.44 15.43 12.57 % Found 50.42 4.6015.14 12.54

A small slurry of the scale-up material was stored for ca. 1.5 months atca. 4° C. Upon re-analyzing the material by PLM analysis, the crystalsappeared as very flat, rod-shaped particles in comparison to thefibrous, needle-like particles previously observed (not shown). Thematerial converted to the same form as the one obtained upon drying witha change in crystal morphology from fibrous needle-like crystals toflat, rod-like crystals. XRPD analysis (FIG. 66) indicated adiffractogram which corresponded with the dry hydrobromide salt material(peaks at 7.59, 15.28, 21.10, 23.21, 30.88, 35.54, 43.58 and47.13°2-theta). The peaks appear very sharp with some preferredorientation in the diffractogram.

Example 12 Primary Polymorph Screening of Hydrobromide Salt

Preparation of Amorphous Material. Hydrobromide salt material was groundusing a Retsch Ball Mill for ca. 25 minutes, with a 5 minute breakmidway to prevent the sample from overheating. The sample was thenanalysed by XRPD to determine form and by HPLC to check for degradation.Post grinding XRPD analysis showed the hydrobromide salt material to beamorphous with an HPLC purity of ca.99.5%. (FIG. 79). Amorphous materialwas desired in order to both increase the solubility and not to bias thescreening study towards one particular form.

Solvent Solubility Screen. Approximately 10 mg of amorphous hydrobromidesalt was placed in each of 24 vials and 5 volume aliquots of theappropriate solvent system was added to the vial. Between each addition,the mixture was checked for dissolution. This procedure was continueduntil dissolution was observed or until 100 volumes of solvent had beenadded. Amorphous hydrobromide salt material was found to be highlysoluble in 3 of the 24 solvent systems but exhibited low solubility inthe remaining solvents. The approximate solubility values of theamorphous hydrobromide salt in the 24 solvent systems are presented inTable 12:

TABLE 12 Approximate Solubility in Selected Solvents ApproximateSolubility Solvent (mg/mL) Acetone <10 Acetone:Water (10%) <10Acetonitrile <10 1-Butanol <10 Cyclohexane <10 Dichloromethane <10Diisopropyl ether <10 Dimethylformamide ca. 67 Dimethylsulfoxide ca. 501,4-Dioxane <10 Ethanol <10 Ethyl acetate <10 Heptane <10 Isopropylacetate <10 3-Methyl-1-butanol <10 Methylethyl ketone <10 Methylisobutyl ketone <10 N-Methyl-2-pyrrolidone ca. 20 Nitromethane <102-Propanol <10 tert-Butylmethyl ether <10 Tetrahydrofuran <10 Toluene<10 Water <10

Temperature Cycling Experiments. The results obtained from thesolubility approximation experiments were used to prepare slurries fortemperature cycling. The slurries were temperature cycled between 4° C.and 25° C. in 4 hour cycles for a period of 72 hours (slurries were heldat 4° C. for 4 hours followed by a hold at ambient for 4 hours, thecooling/heating rates after the 4 hour hold periods was ca. 1° C./min)Solid material was then recovered for analysis.

Crash Cooling Experiments. Crash cooling experiments were performed byplacing saturated solutions of the material, in each of the 24 selectedsolvent systems, in environments of 2° C. and −18° C. for a minimum of48 hours. Any solid material was then recovered for analysis.

Rapid Evaporation Experiments. Rapid evaporation experiments wereconducted by evaporating the solvents from saturated, filtered solutionsof the material, in each of the 24 solvent systems, under vacuum. Anysolid material was then recovered and analysed after the solvent hadevaporated to dryness.

Anti-solvent Addition Experiments. Anti-solvent addition experimentswere conducted at ambient temperature by adding the selectedanti-solvent to saturated, filtered solutions of the material, in eachof the 24 selected solvent systems. The anti-solvent selected washeptane, with tert-butylmethyl ether and water being used for solventsimmiscible with heptane. Addition of anti-solvent was continued untilthere was no further precipitation or until no more anti-solvent couldbe added. Any solid material was recovered and analysed quickly in orderto prevent form changes.

Slow Evaporation Experiments. Slow evaporation experiments wereconducted by evaporating the solvents from saturated, filtered solutionsof the material, in each of the 24 solvent systems at ambientconditions. Any solid material was then recovered and analysed after thesolvent had evaporated to dryness.

Desolvation of Solvated Forms. Potential solvated forms were subjectedto heating on a TGA instrument to a temperature slightly beyond theinitial weight loss. It could then be determined by subsequent XRPDanalysis whether the form had changed as a result of the loss of solventmolecules. After heating to 180° C. using TGA instrumentation, Form Vsolvate was found to have reverted to Form I by XRPD analysis. Theresultant diffractogram is shown in FIG. 80. The attempted desolvationof Form VII resulted in a gum following heating.

Investigation into Wet and Dry Samples of Form I. Initially, wet samplesof Form 1 showed some differences in the XRPD diffractograms to those ofthe dry samples. Further investigation, including drying studiesfollowed by XRPD analysis, TGA, and XRPD analysis with spinning werecarried out. For Form I, the wet material showed significant preferredorientation and shifting was observed in the diffractograms whencompared to the dry material. FIG. 81 shows input material Form Icompared with a wet sample, and after stages of drying.

The results from the experiments conducted during the primary polymorphscreen are shown in Table 13. Results were obtained from PLM and XRPDanalysis. Overall it can be seen that multiple potential polymorphicforms were identified during the screening experiments.

-   -   Form I was obtained from multiple temperature cycling        experiments.    -   Form III, an anhydrous form, was obtained from rapid evaporation        of DMSO, crash cooling to 2° C. in ethanol, and anti-solvent        addition from acetone, acetonitrile, and ethanol.    -   Form IV, a 1,4-dioxane solvate, was obtained from temperature        cycling in 1,4-dioxane.    -   Form V, a DMF solvate, was obtained from temperature cycling and        rapid evaporation from DMF.    -   Form VI, a DMSO solvate, was obtained from temperature cycling        in DMSO.    -   Form VII, a DMSO solvate, was obtained from slow evaporation        from DMSO.

TABLE 13 Results of Primary Hydrobromide Salt Screen Temperature RapidCrash Cool Crash Cool Anti-Solvent Solvent Cycling EvaporationEvaporation (2° C.) (−18° C.) Addition 1 Acetone Form I AM/ AM/ NS NSForm III PLM⁺ PLM⁺ (heptane) 2 Acetone:Water FB Form I FB^(§) FB^(§) FBNS (10%) (heptane) 3 Acetonitrile Form I* AM/ AM/ NS NS Form III PLM⁺PLM⁺ (tBME) 4 1-Butanol Form I NS AM/ NS NS AM/ PLM⁺ PLM (heptane) 5Cyclohexane AM NS NS NS NS NS (heptane) 6 Dichloromethane Form I AM/ AMNS PLM AM/ PLM⁺ PLM (heptane) 7 Diisopropyl ether Form I NS NS NS NS NS(heptane) 8 Dimethylformamide Form V Form I Form V NS NS WD (tBME) 9Dimethylsulfoxide Form VI Form Form III NS AM/ AM VII (WD) PLM^(#†)(water) 10 1,4-Dioxane Form IV NS AM/ NS NS NS PLM⁺ (heptane) 11 EthanolForm I AM/ AM Form PLM Form III PLM^(‡) III{circumflex over ( )}(heptane) 12 Ethyl acetate Form I NS NS NS NS AM/ PLM (heptane) 13Heptane AM NS NS NS NS NS (tBME) 14 Isopropyl acetate Form I NS NS NS NSAM/ PLM (heptane) 15 3-Methyl-1-butanol Form I AM/ AM/ NS NS AM/ PLM⁺PLM⁺ PLM (heptane) 16 Methylethyl ketone Form I AM/ AM NS NS AM PLM⁺(heptane) 17 Methyl isobutyl Form I NS NS NS NS AM/ ketone PLM (heptane)18 N-Methyl-2- Form I NS NS NS NS AM pyrrolidone (tBME) 19 NitromethaneForm I AM/ AM/ NS PLM AM PLM PLM (tBME) 20 2-Propanol Form I AM AM NS NSAM/ PLM (heptane) 21 tert-Butylmethyl Form I NS NS NS NS NS ether(heptane) 22 Tetrahydrofuran Form I AM/ AM/ NS NS AM PLM^(#) PLM^(#)(heptane) 23 Toluene Form I NS NS NS NS NS (heptane) 24 Water FB NS NSNS NS NS AM—amorphous solid NS—no solid observed AM/PLM—amorphous bvXRPD, birefringence observed by PLM FB—Compound 1 free basePLM—birefringence by PLM WD—weak data *poorly crystalline ⁺no clearmorphology {circumflex over ( )}only 2 peaks present; needle-likemorphology ^(#)plate-like morphology ^(†)similar to Form VI ^(‡)rod-likemorphology ^(§)missing peaks

Example 13 Secondary Polymorph Screening of Hydrobromide Salt andDevelopability Assessment

Form III hydrobromide salt of Compound 1 (1 equiv.) was obtained duringthe primary polymorph screen from multiple experiments. This form wastherefore progressed for scale-up and further analysis.

Form III Hydrobromide Salt Preparation. Approximately 500 mg ofamorphous Compound 2 HBr salt material was slurried in ca. 6 mL ofacetonitrile. The suspension was then temperature cycled between 4 and25° C. in four hour cycles for ca. 2 days. The secondary screen analysiswas carried out on the material when it was damp, due to the instabilityof Form III.

During the scale-up of the Form III hydrobromide salt, the materialremained yellow in colour. XRPD analysis showed the material producedfrom scale-up to be crystalline and consistent with the small scale FormIII hydrobromide salt diffractogram. PLM analysis indicatedbirefringent, needle-like crystals when wet. Hot stage microscopyindicated that as the solvent dried off between 40 and 50° C., thecrystal morphology changed to more rod-like crystals. By ca. 250° C.,the material was observed to melt. For TGA/DTA analysis, a damp sampleof Form III was placed into the TGA pan. An initial 10.3% weight losswas observed due to the unbound solvent. The form change which occursbetween 40 and 50° C. by hotstage microscopy was masked by the solventloss. A further endotherm corresponding with Form I hydrobromide saltwas observed at onset ca. 239° C. (peak ca. 245° C.). DSC analysisindicated an initial endotherm from the outset up to approximately 100°C. A final endotherm was observed at onset ca. 233° C. (peak ca. 247°C.), which appears consistent with the Form I melt. IR spectroscopyindicated very small differences between the IR spectrums of Forms I andIII.

DVS analysis showed the following observations:

-   -   Cycle 1—Sorption 20-90% RH        -   Sample gradually takes up ca. 1.045% mass.    -   Cycle 2—Desorption 90-0% RH        -   Between 90-0% RH, sample mass decreases gradually by ca.            1.983%.    -   Cycle 3—Sorption 0-20% RH        -   Moisture uptake of ca. 0.535% between 0-20% RH.

The material was observed to be slightly hygroscopic. Post DVS XRPDindicated that the material converted to Form I hydrobromide salt duringDVS analysis. ¹H NMR spectroscopy carried out in deuterated DMSO showeda spectrum which corresponded with the Form I hydrobromide salt. KFanalysis indicated the presence of 1.4% water. HPLC purity analysisindicated a purity of ca. 99.43%. Ion chromatography indicated thepresence of 12.17% bromide (ca. 12.57% required for 1 equivalent).

XRPD analysis carried out on the thermodynamic solubility experimentsolids remaining after 24 hours, indicated that for the pH 6.6 and 4.5experiments, the Form III hydrobromide salt converted to a freebasehydrate form, the solid from the pH 3.0 experiment became amorphous andthe solid from the pH 1 experiment remained predominantly consistentwith the Form III hydrobromide, with some loss in crystallinity.

7 day Stability Studies at 25° C., 80° C., 40° C./75% RH (open andclosed conditions). Approximately 15 mg of Form III was placed intovials and then exposed to 25° C., 80° C. and 40° C./75% RH environments(open and closed vials) for 1 week to determine stability. The resultingsolids were analysed by XRPD and HPLC to establish if any changes hadoccurred. The 1 week stability studies carried out in open and closedvials at 25° C., 80° C. and 40° C./75% RH indicated the followingresults:

TABLE 14 7 day stability studies (open container) Condition Purity XRPDanalysis 40° C./75% RH 98.3% Form I 80° C. 98.7% Form I (some loss incrystallinity) 25° C. 98.2% Form I

TABLE 15 7 day stability studies (closed container) Condition PurityXRPD analysis 40° C./75% RH 99.0% Form I 80° C. 99.0% Form I 25° C.98.9% Form I

From the characterisation carried out on Form III, this form wasdetermined to be a metastable, likely anhydrous form of the hydrobromidesalt. Form III was observed to be very unstable with conversion to FormI occurring upon isolation and drying of the material.

Thermodynamic Solubility Studies. Slurries of Form III were created inmedia of various pH (pH 1; pH 3; pH 4.5 and pH 6.6) and shaken for ca.24 hours. After 24 hours, the slurries were filtered and the solutionanalysed by HPLC in order to determine the solubility at the various pHlevels. For the buffer solutions, KCl/HCl was used for pH 1 andcitrate/phosphate combinations for pH 3, 4.5 and 6.6 (10 mM). The pH ofthe solutions was also measured prior to HPLC analysis. XRPD analysiswas carried out on the remaining solids after 24 hours of shaking.

Thermodynamic solubility experiments carried out in buffers pH 1, 3.0,4.5 and 6.6 indicated the following result:

TABLE 16 Thermodynamic Solubility Studies Buffer pH pH prior to analysisSolubility (mg/mL) 1 0.95 13.88 3 1.53 0.84 4.5 1.79 0.28 6.6 1.79 0.42

Competitive Slurry Experiments. Competitive slurry experiments were setup in acetone, isopropanol, acetone:water (80:20) and isopropyl acetateat both room temperature (ca. 22° C.) and 60° C. Approximately 200 mg ofeach of Forms I and III material was placed into a vial and 4 mL of theappropriate solvent system was added to produce a slurry. For eachexperiment, the slurries were allowed to stir for ca. 3 days. Analysisby XRPD was then conducted to determine the form of the resultant solid.Competitive slurry experiments of Form I vs. Form III were carried outin 4 solvent systems and resulting solids were analysed by XRPD analysis(FIG. 82 and FIG. 83). Results are summarised in Table 17.

TABLE 17 Summary of results from competitive slurry experiments IngoingForms Solvent Temperature Result I and III Acetone RT (ca. 22° C.) FormI I and III Acetone 60° C. Form I I and III Isopropanol RT (ca. 22° C.)Form I I and III Isopropanol 60° C. Form I I and III Acetone:water(80:20) RT (ca. 22° C.) Form VIII I and III Acetone:water (80:20) 60° C.Form VIII I and III Isopropyl acetate RT (ca. 22° C.) Form I I and IIIIsopropyl acetate 60° C. Form I

From the competitive slurry experiments, Form I was found to be thethermodynamically most stable form in acetone, isopropanol and isopropylacetate at both ambient and 60° C. In acetone:water (80:20), conversionto an unidentified form resulted (labelled as Form VIII).

Characterization of Form VIII. An initial assessment of Form VIII,obtained from competitive slurry experiments of Forms I and III inacetone:water (80:20), was made in order to determine the nature of theform and evaluate whether it is consistent with freebase material or theHBr salt. The material resulting from the competitive slurry experimentsappeared light yellow in colour. PLM analysis indicated birefringentmaterial with no clearly defined morphology. After drying under vacuumfor ca. 24 hours, the TGA/DTA indicated a weight loss of 5.2% from theoutset followed by a second weight loss of 1.2%, with endotherms in theDTA trace at ca. 40° C. and ca. 96° C. A final endotherm was observed inthe DTA trace at onset ca. 184° C. (peak ca. 194° C.). Very littlechange was observed by hotstage microscopy prior to the melt at ca. 197°C. DSC analysis indicated a broad endotherm starting from the outset(peak ca. 93° C.) followed by a second endotherm at peak ca. 140° C. anda third endotherm at onset ca. 178° C. (peak ca. 193° C.). Ionchromatography indicated a bromide content of 12.8% (approximately 1equivalent).

In order to examine the effect of desolvating/dehydrating Form VIII, thematerial was heated to 150° C. in a TGA pan and XRPD analysis was thencarried out. The polymorphic form appeared to remain the same. Afterheating to 150° C. and carrying out XRPD analysis, TGA analysis wasagain carried out on the same material and showed a weight loss of 6.0%from the outset followed by a second weight loss of 0.9%, withendotherms in the DTA trace at ca. 42° C. and 96° C. A final endothermwas observed in the DTA trace at onset ca. 186° C. (peak ca. 194° C.).The sample appeared to re-hydrate when exposed to atmosphericconditions. This would likely explain the consistency between the XRPDdiffractograms before and after desolvation/dehydration.

Hydration Studies at 55° C. Slurries were created using ca. 200 mg ofForm I salt material in 2 mL of the appropriate solvent system. Thesewere stirred at ca. 55° C. for 6 hours. The solvent systems used arelisted in Table 18.

TABLE 18 Solvent Systems for Hydration Studies at 55° C. Solvent SystemEthanol:Water (1%) Ethanol:Water (2%) Ethanol:Water (5%) Ethanol:Water(10%) IPA/Acetone (9:1):Water (1%) IPA/Acetone (9:1):Water (2%)IPA/Acetone (9:1):Water (5%) IPA/Acetone (9:1):Water (10%)

Following the hydration studies, material was analysed by XRPD todetermine whether hydration or disproportionation had occurred at thevarious water activity levels. XRPD analysis of EtOH:Water samplesrevealed that, at 1, 2, and 5% water, the resultant diffractogramscorresponded with the Form I input HBr salt material. At 10% water, theHBr hydrate was formed. The same pattern emerged for samples slurried inIPA/Acetone(9:1): Water mixtures, where at 1, 2, and 5% water theresultant diffractograms corresponded with the input Form I HBr salt,however, at 10% water, the HBr hydrate was obtained. The diffractogramscan be seen in FIG. 84 and FIG. 85.

Hydration Studies at 15° C. and 35° C. Slurries were created using ca.200 mg of Form I salt material in 2 mL of the appropriate solventsystem. These were stirred at ca. 15° C. and ca. 35° C. for 24 hours.The solvent systems used are listed in Table 19.

TABLE 19 Solvent Systems for Hydration Studies at 15° C. and 35° C.Solvent System Temperature Ethanol:Water (2%) 35° C. Ethanol:Water (2%)15° C. IPA/Acetone (9:1):Water (2%) 35° C. IPA/Acetone (9:1):Water (2%)15° C.

Following the hydration studies, XRPD analysis of samples revealed thatthe resultant diffractograms corresponded with the Form I HBr salt andhydration did not occur at the 2% water level. The diffractograms can beseen in FIG. 86.

The results of the polymorph screen for the hydrobromide salt ofcompound 1 (compound 2 hydrobromide) is depicted in FIG. 87. Compound 2hydrobromide exists in eight (8) different solid forms, includingamorphous, anhydrous, solvated and hydrated forms. FIG. 87 illustratesthe interconversion between several of the identified forms, with Form Iexhibiting particular stability under a variety of conditions.

Example 14 Dog PK Study 1

Compound 1 free base and compound 2, as the Form I monohydrobromide(HBr) salt, were evaluated in a cross-over dog PK study. Compound 1 freebase capsule consisted of compound 1 free base in Vitamin E TPGS and PEG400 filled into a capsule. The Form I hydrobromide salt capsuleconsisted of Form I HBr alone filled into a capsule.

Compound 1 free base capsule and Form I HBr capsule were dosed orally at28.5 and 24.5 mg/kg (as active) QD, respectively, to three fasted malenon-naïve beagle dogs (body weight range: 10.1-10.8 kg) with a 5-daywashout period. Approximately 5 mL of tap water was orally administeredto encourage swallowing and ensure delivery of capsules into thestomach. Plasma samples were collected at pre-dose and 0.5, 1, 2, 4, 6,8, 12 and 24 hours post dose. The plasma concentrations of compound 1were determined by a liquid chromatography-tandem mass spectrometry(LC/MS/MS) method. The results are provided in Table 20.

When compound 1 is administered orally to fasted dogs at 24.5-28.5 mg/kgQD, compound 1 exposure (based on AUC and C_(max)) is significantlyhigher when drug is administered as the Form I HBr salt compared to thefree base form.

TABLE 20 Mean pharmacokinetic parameters (% CV) of compound 1 in fasteddogs (n = 3) receiving compound 1 (free base) capsule and compound 2(Form I hydrobromide) capsule orally PK Values (% CV) Compound 1 (FreeCompound 2 (Form I Dog PK Base) Capsule Hydrobromide) Capsule Parameters28.5 mg/kg 24.5 mg/kg C_(max) (ng/mL) 120* 1420 (47%) T_(max) (h) 1*(median) 2 (median) AUC₀₋₂₄ (ng · h/mL) 278* 5260 (74%) T_(1/2) (h)   2.1* 2.4 *Dog #3 had emesis at 30 min post dose. At the 1 h timepoint, a partial capsule was found under its cage. Thus, data from dog#3 was not included in the calculation of PK parameters.

Example 15 Dog PK Study 2

Compound 1 free base and compound 2, as the Form I monohydrobromide(HBr) salt, were evaluated in a cross-over dog PK study in which maledogs were pre-treated with either pentagastrin (to decrease gastric pH)or famotidine (to increase gastric pH) prior to oral dosing to controlgastric pH. In addition, the effect of food on the systemic exposure tocompound 1 was also evaluated in dogs receiving Form I HBr withpentagastrin pre-treatment. Compound 1 free base capsule consisted ofcompound 1 free base in Vitamin E TPGS and PEG 400 filled into acapsule. The Form I hydrobromide salt capsule consisted of Form I HBralone filled into a capsule.

Compound 1 free base and Form I HBr capsules were dosed orally at 30mg/kg (as active) QD to three non-naïve male beagle dogs (body weightrange: 9.6-10.5 kg) that were treated prior to dosing with 1)pentagastrin and fasted, 2) famotidine and fasted, or 3) pentagastrinand fed. There was a minimum 6-day washout between dosing. On the day ofdosing under fed condition, dogs were given 60 gram of a high fat diet(Harlan Teklad 2027C) and allowed to consume all of the food within15-20 minutes. The animals were given a 10-minute rest period and thenthe capsule doses were administered. Plasma samples were collected atpre-dose and 0.5, 1, 2, 4, 6, 8, 12 and 24 hours post dose. The resultsare provided in Table 21.

When compound 1 was administered orally to dogs at 30 mg/kg QD, compound1 exposure was significantly higher when drug is administered as the HBrsalt compared to the free base form under both low and high gastric pHconditions. In dogs receiving the free base capsules under high gastricpH condition, a 32- to 48-fold reduction in compound 1 exposure wasobserved compared to that under low pH condition. The effect of varyinggastric pH on the systemic exposure to compound 1, measured as C_(max)and AUC, was greatly minimized when Form I HBr was administered.Administering Form I HBr with food resulted in an increase in C_(max)and AUC of compound 1 in dogs.

TABLE 21 Mean pharmacokinetic parameters (% CV) of compound 1 in dogs (n= 3) receiving compound 1 (free base) capsule and compound 2 (Form Ihydrobromide) capsule orally following gastric pH adjustment treatmentPK Values (% CV) Compound 1 Compound 2 (Form I Treatment of (Free Base)Capsule Hydrobromide) Capsule Dogs Prior C_(max) AUC₀₋₂₄ C_(max) AUC₀₋₂₄to Dosing (ng/mL) (ng · h/mL) (ng/mL) (ng · h/mL) Pentagastrin, 1820(20%) 7810 (73%) 2860 (39%) 9450 (31%) fasted Famotidine,  57 (24%) 163(3%) 1180 (20%) 4010 (54%) fasted Pentagastrin, Not Dosed Not Dosed 3970(28%) 13900 (26%)  fed

Example 16 Administration to Healthy Volunteers

The primary objective of the study is to compare the compound 1pharmacokinetic (PK) profiles of single doses of Form I monohydrobromideformulations with that of the compound 1 free base in healthy adultmales.

This is a single centre non-randomised, open-label, single dose study inhealthy male subjects. Subjects will be screened for eligibility toparticipate in the study up to 28 days before dosing. The subjects willbe admitted to the clinical unit at approximately 09:00 in the morningon the day prior to dosing (Day-1) and will remain on site until 24 hafter each dose. Each subject will attend a follow-up visit 4 to 6 daysafter the final dose.

One group of 12 subjects will be dosed in an effort to obtain the datadescribed above. Each subject will receive the following formulations ina crossover investigation. Dosing will be separated by at least 7 days.

-   -   Regimen A: 150 mg compound 1 (free base) capsule    -   Regimen B: 50 mg as active compound 2 (Form I HBr) tablet        formulation    -   Regimen C: ≦150 mg as active compound 2 (Form I HBr) tablet        formulation

All formulations will be dosed in the morning, following an overnightfast. Subjects will be allowed water up to 2 h before the scheduleddosing time and will be provided with 240 mL of water at 2 h post-dose.Decaffeinated fluids will be allowed ad libitum from lunch time on theday of dosing.

If, for technical reasons, dosing is delayed for more than 2 h beyondthe expected dosing time, subjects will receive 200 mL of Lucozade Sportat the originally scheduled dosing time, or earlier if possible.

Subjects will be provided with a light snack and then fast from all foodand drink (except water) for a minimum of 8 h on the day prior to dosinguntil approximately 4 h post-dose at which time lunch will be provided.An evening meal will be provided at approximately 9 h post-dose and anevening snack at approximately 14 h post-dose. On subsequent days, mealswill be provided at appropriate times.

Venous blood samples will be withdrawn via an indwelling cannula or byvenepuncture at the following times after dosing (hours): 0.5, 1, 1.5,2, 4, 8, and 12.

The primary endpoint of the study is to compare the PK profiles of aformulation of Form I HBr with that of compound 1 as a free base bymeasuring the following parameters: T_(lag), C_(max), T_(max),AUC_((0-last)), AUC_((0-inf)), AUC_(%extrap), F_(rel), lambda-z,T_(1/2)el. The secondary endpoint of the study is to collect informationabout the safety and tolerability of compound 1 (free base) and compound2 (Form I HBr salt) by assessing: physical examinations, safetylaboratory tests, vital signs, electrocardiograms (ECGs), bodytemperature and AEs.

Plasma concentration data will be tabulated and plotted for each subjectfor whom concentrations are quantifiable. PK analysis of theconcentration time data obtained will be performed using appropriatenon-compartmental techniques to obtain estimates of the following PKparameters (where relevant).

-   -   T_(lag) the sampling time before the first quantifiable        concentration of compound 1 in a concentration vs time profile    -   C_(max) the maximum observed plasma concentration    -   T_(max) the time from dosing at which C_(max) occurs    -   AUC_((0-last)) the area under the concentration vs time curve        from time zero to the last measured time point    -   AUC_((0-inf)) the area under the concentration vs time curve        from time zero extrapolated to infinity    -   AUC_(%extrap) the percentage of AUC_((0-inf)) accounted for by        extrapolation    -   AUC_((0-tau)) the area under the concentration vs time curve        within the dosing interval, estimated using the [linear or        linear/log down] trapezoidal rule    -   AUC₍₀₋₂₄₎ the area under the concentration vs time curve from        time zero to 24 hour post morning dose    -   RA relative accumulation

F_(rel) relative bioavailability of the test formulations compared withthe reference formulation eg Regimens B, or C (test) compared withRegimen A (reference)

-   -   lambda-z slope of the regression line passing through the        apparent elimination phase in a concentration vs time plot    -   T_(1/2)el the apparent elimination half-life    -   Assessment of dose proportionality, as appropriate eg C_(max)/D;        AUC/D

The initial 50 mg HBr dose selected for Regimen B (determined by AUC) isanticipated to be that which is expected to give a similar exposure tothe 150 mg free base. This dose is also expected to provide lesspatient-to-patient variability.

There will be an interim analysis after completion of Regimens A and Bduring which the safety, tolerability and PK data will be reviewed.These data will be used to assess whether dose adjustment is needed. Fordose selection to proceed, safety data from a minimum of 8 evaluablesubjects (defined as subjects who have received study drug and havecompleted all safety assessments up to 24 h) in a group must beavailable for review. The dose selected for Regimen C will be that whichis expected to give a similar exposure to the 150 mg free base. However,if the 50 mg HBr dose used in Regimen B exceeds the exposure of the 150mg free base, and is well tolerated and within the limits defined withinthe protocol, Regimen C will not occur.

If the dose is changed, the Form I HBr formulation will be dosed againat the revised dose (Regimen C). There will then follow a further periodof interim analysis to confirm that the Regimen C dose provideseither, 1) a lower active dose as compared to Regimen A that provides anequivalent or higher exposure and/or provide less patient-to-patientvariability, or 2) an active dose similar to that of Regimen A with ahigher exposure and/or provide less patient-to-patient variability.

We claim:
 1. Compound 2:

wherein: n is 1 or 2; and X is hydrobromic acid, benzenesulfonic acid,camphor sulfonic acid, 1,2-ethane disulfonic acid, hydrochloric acid,maleic acid, methanesulfonic acid, naphthalene-2-sulfonic acid,1,5-naphthalene disulfonic acid, oxalic acid, 4-toluenesulfonic acid or2,4,6-trihydroxybenzoic acid.
 2. The compound of claim 1, wherein X ishydrobromic acid.
 3. The compound of claim 2, wherein the compound is aForm I hydrobromic acid salt characterized by one or more peaks in apowder X-ray diffraction pattern selected from those at about 17.39,about 19.45, about 21.41, about 23.56 and about 27.45 degrees 2-theta.4. The compound of claim 3, wherein the compound is a Form I hydrobromicacid salt characterized by two or more peaks in a powder X-raydiffraction pattern selected from those at about 17.39, about 19.45,about 21.41, about 23.56 and about 27.45 degrees 2-theta.
 5. Thecompound of claim 4, wherein the compound is a Form I hydrobromic acidsalt characterized by three or more peaks in a powder X-ray diffractionpattern selected from those at about 17.39, about 19.45, about 21.41,about 23.56 and about 27.45 degrees 2-theta.
 6. The compound of claim 5,wherein the compound is a Form I hydrobromic acid salt characterized bysubstantially all of the peaks in a X-ray powder diffraction patternselected from those at about 9.84, 15.62, 17.39, 19.45, 20.69, 21.41,22.38, 23.56, 25.08 and 27.45 degrees 2-theta.
 7. The compound of claim6, wherein the compound is a Form I hydrobromic acid salt characterizedby substantially all of the peaks in a X-ray powder diffraction patternselected from those at about °2-Theta 3.17 3.48 3.79 5.60 7.92 8.35 9.8411.52 14.10 15.23 15.62 16.73 17.39 18.23 19.45 20.69 21.41 22.38 23.5624.65 25.08 26.26 27.45 28.50 29.06 29.77 29.94 30.66 31.35 32.45 32.8234.18 34.80 35.35 36.01 36.82 37.61 37.96 38.55 39.13 40.04 40.64 40.8641.03 41.39 42.16 42.48 42.78 44.28 45.34 45.59 46.57 47.20 47.51


8. The compound of claim 2, wherein the compound is a Form IIIhydrobromic acid salt characterized by one or more peaks in a powderX-ray diffraction pattern selected from those at about 6.79, about13.36, about 19.93, about 20.89, about 21.90, about 22.70, about 22.91and about 26.34 degrees 2-theta.
 9. The compound of claim 2, wherein thecompound is a Form IV hydrobromic acid salt characterized by one or morepeaks in a powder X-ray diffraction pattern selected from those at about6.45, about 12.96, about 19.38, about 19.79, about 21.37 and about 21.58degrees 2-theta.
 10. The compound of claim 2, wherein the compound is aForm V hydrobromic acid salt characterized by one or more peaks in apowder X-ray diffraction pattern selected from those at about 6.17,about 6.99, about 12.50, about 14.14, about 17.72 and about 23.12degrees 2-theta.
 11. The compound of claim 2, wherein the compound is aForm VI hydrobromic acid salt characterized by one or more peaks in apowder X-ray diffraction pattern selected from those at about 8.38,about 9.38, about 18.93, and about 21.58 degrees 2-theta.
 12. Thecompound of claim 2, wherein the compound is a Form VII hydrobromic acidsalt characterized by one or more peaks in a powder X-ray diffractionpattern selected from those at about 15.91, about 19.10, about 19.53,about 20.24, about 22.64 and about 25.58 degrees 2-theta.
 13. Thecompound of claim 2, wherein the compound is a Form VIII hydrobromicacid salt characterized by one or more peaks in a powder X-raydiffraction pattern selected from those at about 8.79, about 11.13,about 19.97, about 21.31, about 21.56, about 25.30 and about 26.65degrees 2-theta.
 14. The compound of claim 1, wherein X isbenzenesulfonic acid.
 15. The compound of claim 14, wherein the compoundis a hydrate.
 16. The compound of claim 15, having one or more peaks ina powder X-ray diffraction pattern selected from those at about 10.68,about 16.10, about 18.44 and about 22.36 degrees 2-theta.
 17. Thecompound of claim 1, wherein X is camphor sulfonic acid.
 18. Thecompound of claim 1, wherein X is 1,2-ethane disulfonic acid.
 19. Thecompound of claim 1, wherein X is hydrochloric acid.
 20. The compound ofclaim 1, wherein X is maleic acid.
 21. The compound of claim 1, whereinX is methanesulfonic acid.
 22. The compound of claim 1, wherein X isnaphthalene-2-sulfonic acid.
 23. The compound of claim 1, wherein X is1,5-naphthalene disulfonic acid.
 24. The compound of claim 1, wherein Xis oxalic acid.
 25. The compound of claim 1, wherein X isp-toluenesulfonic acid.
 26. The compound of claim 1, wherein X is2,4,6-trihydroxybenzoic acid.
 27. A composition comprising the compoundof claim 1 and a pharmaceutically acceptable carrier or excipient.
 28. Amethod for inhibiting at least one mutant of EGFR selectively ascompared to wild type (WT) EGFR, in a biological sample or in a patient,comprising contacting the biological sample with, or administering tothe patient, a compound according to claim 1, or a composition thereof.29. The method according to claim 28, wherein said method is sparing forWT EGFR.
 30. The method according to claim 28, wherein the at least onemutant is an activating mutant, a deletion mutant, a point mutation, ora mutant selected from T790M, delE746-A750, L858R, G719S.
 31. A methodfor treating a mutant EGFR-mediated disorder or condition in a patient,comprising administering to the patient a composition according to claim27.
 32. The method of claim 31, wherein the disorder or condition is acancer.